1Y0-A26 - Citrix XenServer 6.0 Administration - GRATIS EXAM · -p port-s server Example: On a ......

1Y0-A26 - Citrix XenServer 6.0 Administration

Number: 1Y0-A26Passing Score: 640Time Limit: 90 minFile Version: 1.1

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Citrix XenServer 6.0 Administration

Citrix 1Y0-A26 Exam

Delivery Details

Number of Questions

The A26 exam has 65 questions written in English

Passing Score

The passing score is 64%

CCI Passing Score

Citrix Certified Instructors must obtain 80% on this test to get authorized to teach the associated course

Time Limit

90 Minutes

Exam Preparation Guide:http://training.citrix.com/mod/ctxmodviewer/view.php?mod=resource&id=243

Exam A

QUESTION 1When starting up a XenServer from SAN, the BIOS of the ___________ contains the instructions that enablethe host to find the boot disk. (Choose the correct option to complete the sentence.)

A. host machineB. array controllerC. host bus adapterD. network interface card

Correct Answer: CSection: (none)Explanation

Explanation/Reference:Citrix XenServer ® 6.1.0 Installation Guide

Appendix B. Boot From SAN Environments

Boot from SAN environments offer a number of advantages, including high performance, redundancy andspaceconsolidation. In these environments, the boot disk resides on a remote SAN, and not on the local host. Thediskless host communicates with the SAN through a host bus adapter (HBA), and the BIOS of the HBAcontainsthe instructions that enable the host to find the b oot disk.

http://support.citrix.com/article/CTX134586

QUESTION 2An administrator is setting up the XenServer hosts in an environment to boot from SAN.

In which BIOS would the administrator go to enable XenServer to boot from SAN?

A. HostB. Array controllerC. Network interface cardD. Primary host bus adapter

Correct Answer: DSection: (none)Explanation


Appendix B. Boot From SAN Environments

Boot from SAN environments offer a number of advantages, including high performance, redundancy andspaceconsolidation. In these environments, the boot disk resides on a remote SAN, and not on the local host. Thediskless host communicates with the SAN through a host bus adapter (HBA), and the BIOS of the HBAcontainsthe instructions that enable the host to find the b oot disk.


QUESTION 3An administrator needs to export a virtual machine to an NFS share mounted on a XenServer host.

Which xe CLI command does the administrator need to execute from a remote machine to perform the virtualmachine export?

A. xe vm-export -s <hostname> filename=<pathname_of_file>B. xe vm-export -s <hostname> -u <root> -pw <password> vm=<vm_name>C. xe vm-export -s <hostname> -u <root> -pw <password> filename=<pathname_of_file>D. xe vm-export -s <hostname> -u <root> -pw <password> vm=<vm_name> filename=<pathname_of_file>


Explanation/Reference:Citrix XenServer ® 6.1.0 Administrator's Guide

A.4.27.21. vm-exportvm-export filename=<export_filename>[metadata=<true | false>][<vm-selector>=<vm_selector_value>...]

Export the specified VMs (including disk images) to a file on the local machine. Specify the filename to exporttheVM into using the filename parameter. By convention, the filename should have a .xva extension.

If the metadata parameter is true, then the disks are not exported, and only the VM metadata is written tothe output file. This is intended to be used when the underlying storage is transferred through othermechanisms,and permits the VM information to be recreated (see Section A.4.27.22, “vm-import”).

The VM or VMs on which this operation should be performed are selected using the standard selectionmechanism (see VM selectors). Optional arguments can be any number of the VM parameters listed at thebeginning of this section.

A.4.27.1. VM SelectorsSeveral of the commands listed here have a common mechanism for selecting one or more VMs on which toperform the operation. The simplest way is by supplying the argument vm=<name_or_uuid>.

A.1. Basic xe SyntaxThe basic syntax of all XenServer xe CLI commands is:xe <command-name> <argument=value> <argument=value> ...

If the xe command is executed remotely, additional connection and authentication arguments are used.

The server argument is used to specify the hostname or IP address. The username and passwordarguments are used to specify credentials. A password-file argument can be specified instead of thepassword directly.

Shorthand syntax is also available for remote connection arguments:-u username-pw password-pwf password file-p port

-s server

Example: On a remote XenServer host:

xe vm-list -u <myuser> -pw <mypassword> -s <hostname>


QUESTION 4Scenario: An administrator is working with a production resource pool and a test resource pool. Theadministrator needs to move three virtual machines from the test resource pool into the production resourcepool.

Which action must the administrator take to meet the requirements of the scenario?

A. Drag the three virtual machines from the test resource pool to the production resource pool.B. Convert the three virtual machines to templates and deploy the templates into the production resource pool.C. Copy the three virtual machines and import the copies of the virtual machines into the production resource

pool.D. Export the three virtual machines as backups and import the virtual machines into the production resource

pool.


Explanation/Reference:Citrix XenServer ® 6.1.0 Virtual Machine User's Gui de

6.1.1. XenMotion

XenMotion is available in all versions of XenServer and allows you to move a running VM from one host toanotherhost, when the VMs disks are located on storage shared by both hosts. This allows for pool maintenancefeaturessuch as Workload Balancing (WLB), High Availability (HA), and Rolling Pool Upgrade (RPU) to automaticallymoveVMs. These features allow for workload levelling, infrastructure resilience, and the upgrade of server software,without any VM downtime.

Note:Storage can only be shared between hosts in the sam e pool. As a result VMs can only bemigrated to hosts in the same pool .

This requires the VMs to be exported from the test resource pool and imported into the productionresource pool


STUDY NOTE (The below is relevant to V6.1.0 and is therefore not within consideration forthe 6.0 exam):

XenServer 6.1.0 includes the following new features and ongoing improvements:

6.1.2. Storage XenMotionNote:Storage XenMotion feature is only available in Citrix XenServer Advanced Edition or higher.

Storage XenMotion must not be used in XenDesktop deployments.

Storage XenMotion additionally allows VMs to be moved from one host to another, where the VMs are notlocatedon storage shared between the two hosts. As a result, VMs stored on local storage can be migrated withoutdowntime and VMs can be moved from one pool to another . This enables system administrators to:

rebalance VMs between XenServer pools (for example from a development environment to a productionenvironment).

XenServer 6.1.0 Release Notes : http://support.citrix.com/article/CTX134582

QUESTION 5Scenario: An administrator is creating a vDisk image of a physical Windows server using XenConvert. ThisvDisk is going to be used by multiple target devices in Standard Image mode.


Which two steps does the administrator need to take to prepare the Windows server for physical- to-virtualconversion? (Choose two.)

A. Disable Windows Autoplay.B. Enable Windows Automount.C. Put the server in Standby mode.D. Format the hard disk drive of the server.

Correct Answer: ABSection: (none)Explanation

Explanation/Reference:Citrix XenConvert 2.5 Guide

Preparing the Host Machine For best results, prepare the host machine as follows.

Enable Windows Automount on Windows Server operating systems. Disable Windows Autoplay. Remove any virtualization software before performing a conversion. Verify adequate free space exists on the destination, which is approximately 101% of used space of allsource volumes. Remove any network interface teams because it is not applicable to a virtual machine.


QUESTION 6

Scenario: An administrator is creating a vDisk image of a physical Windows server using XenConvert. ThisvDisk is going to be used by multiple target devices in Standard Image mode.

What does the administrator need to do during the physical-to-virtual conversion to increase the vDiskperformance?

A. SysPrep the vDisk.B. Optimize the vDisk.C. Run the Windows server in Safe mode.D. Defragment the physical hard disk before conversion.

Correct Answer: BSection: (none)Explanation

Explanation/Reference:Explanation:

QUESTION 7Which two CLI commands will correctly restart a virtual machine? (Choose two.)

A. xe vm-start vm=<vm_name>B. xe vm-reboot vm=<vm_name>C. xe vm-reboot uuid=<vm_UUID>D. xe vm-reset-powerstate vm=<vm_name> -force

Correct Answer: BCSection: (none)Explanation

Explanation/Reference:A.4.27.26. vm-reboot

vm-reboot [<vm-selector>=<vm_selector_value>...] [force=<true>]

Reboot the specified VMs.

The VM or VMs on which this operation should be performed are selected using the standard selectionmechanism (see VM selectors). Optional arguments can be any number of the VM parameters listed at thebeginning of this section.Use the force argument to cause an ungraceful shutdown, akin to pulling the plug on a physical server.

QUESTION 8Scenario: An administrator manages four XenServer hosts in a resource pool. To increase capacity, theadministrator purchased one new host, which is a different CPU model, but from the same manufacturer. Theadministrator CANNOT add the new server to the existing pool.

What does the administrator need to use to force the host to join the existing pool?

A. Command lineB. Maintenance ModeC. Add to Pool WizardD. Add Server Wizard

Correct Answer: ASection: (none)

Explanation


3.4. Creating Heterogeneous Resource Pools

XenServer 6.1.0 simplifies expanding deployments over time by allowing disparate host hardware to be joinedinto a resource pool, known as heterogeneous resource pools. Heterogeneous resource pools are madepossibleby leveraging technologies in recent Intel (FlexMigration) and AMD (Extended Migration) CPUs that provideCPU"masking" or "leveling". These features allow a CPU to be configured to appear as providing a different make,model, or functionality than it actually does. This enables you to create pools of hosts with disparate CPUs butstill safely support live migrations.

To add a heterogeneous XenServer host to a resource pool using the xe CLI1. Find the CPU features of the Pool Master by running the xe host-get-cpu-features command.2. On the new server, run the xe host-set-cpu-features command and copy and paste the Pool Master'sfeatures into the features parameter. For example:xe host-set-cpu-features features=<pool_master's_cpu_ features>3. Restart the new server.4. Run the xe pool-join command on the new server to join the pool.

QUESTION 9Scenario: An administrator needs to add a new server to an existing pool in a remote datacenter.The administrator has NO access to XenCenter.

Which command does the administrator need to use to prepare a XenServer host before adding it to aheterogeneous resource pool?

A. host-cpu-listB. host-sync-dataC. host-param-setD. host-set-cpu-features





To add a heterogeneous XenServer host to a resource pool using the xe CLI

1. Find the CPU features of the Pool Master by running the xe host-get-cpu-features command.2. On the new server, run the xe host-set-cpu-features command and copy and paste the Pool Master'sfeatures into the features parameter. For example:

xe host-set-cpu-features features=<pool_master's_cpu_ features >

3. Restart the new server.4. Run the xe pool-join command on the new server to join the pool.

QUESTION 10An administrator needs to create a resource pool of XenServer hosts.

Which two options are required of each host to create a homogeneous resource pool? (Choose two.)

A. Shared storageB. Same vendor and CPU typeC. XenServer Advanced License or higherD. Same version of XenServer and hotfixes installed

Correct Answer: BDSection: (none)Explanation


3.2. Requirements for Creating Resource PoolsA resource pool is a homogeneous (or heterogeneous with restrictions, see Section 3.4, “CreatingHeterogeneousResource Pools”) aggregate of one or more XenServer hosts, up to a maximum of 16. The definition ofhomogeneous is:

• the CPUs on the server joining the pool are the same (in terms of vendor, model, and features) as the CPUson servers already in the pool.

• the server joining the pool is running the same version of XenServer software, at the same patch level, asservers already in the pool

QUESTION 11Scenario: An administrator needs to create a single resource pool containing six XenServer hosts.All hosts have the same CPU manufacturer, but different CPU model.

Which two host parameters need to be the same across all hosts to create a heterogeneous resource pool?(Choose two.)

A. Time zoneB. Usable memoryC. Installed hotfixesD. XenServer version

Correct Answer: CDSection: (none)Explanation




Using XenServer to mask the CPU features of a new server, so that it will match the features of the existingserversin a pool, requires the following:

the CPUs of the server joining the pool must be of the same vendor (i.e. AMD, Intel) as the CPUs onservers already in the pool, though the specific type, (family, model and stepping numbers) need not be.the CPUs of the server joining the pool must support either Intel FlexMigration or AMD Enhanced Migration.the features of the older CPUs must be a sub-set of the features of the CPUs of the server joining the pool.the server joining the pool is running the same ver sion of XenServer software, with the samehotfixes installed, as servers already in the pool.XenServer Advanced edition or higher.

QUESTION 12Scenario: A XenServer pool consists of two XenServer hosts that each have four network interface cards(NICs). The first two NICs form a bond that is used for management and virtual machine network traffic. Theother two NICs are unused. The administrator notices that the system is using all available network bandwidthand iSCSI disk performance is being affected.

Which network type could the administrator create to move the storage traffic to one of the unused NICs?

A. BondedB. ManagementC. Cross-server privateD. Single-server private



QUESTION 13Scenario: In preparation for adding a new iSCSI SAN to the environment, an administrator needs to separatethe storage traffic from the XenServer management traffic.The host is connected to the iSCSI SAN on the 192.168.30.0/24 subnet using NIC 3.

What must the administrator create to separate the storage network traffic?

A. A bonded networkB. An external networkC. A management interfaceD. A single-server private network

Correct Answer: C

Section: (none)Explanation


QUESTION 14Scenario: An administrator needs to upgrade the current XenServer environment to version 6.0. The currentXenServer environment consists of 20 production virtual machines running mission- critical applications.

When is it appropriate for the administrator to use the rolling pool upgrade wizard in this environment?

A. When upgrading from XenServer 5.5 or earlierB. When high availability is enabled in the current environmentC. When virtual machines in the current environment need to keep runningD. When the current environment contains a SAN adapter for the StorageLink storage repository



7.1. Rolling Pool UpgradesWith XenServer, you can perform rolling pool upgrades. A rolling upgrade allows you to upgrade all of the hostsin a pool in such a way that services and resources offered by the pool are available throughout the upgradeprocess. This upgrade method keeps critical VMs running by enabling you to live migrate them to other hostsinthe pool and then to upgrade one host at a time. This process takes only one XenServer host offline at a time.

Important:Rolling Pool Upgrade should not be used with Boot from SAN environments.

Note:The Rolling Pool Upgrade wizard is included in the latest version of XenCenter and intendedfor those upgrading from XenServer version 5.6 or later to the current version of XenServer.

Warning:If you are upgrading pools (from version 5.6 or later to the current version of XenServer) thatcontain Citrix StorageLink Gateway SRs, note that only the following adapters are supported:NetApp and Dell EqualLogic . If the pool contains VMs running on any other types of CitrixStorageLink Gateway SRs, do not upgrade the pool.

While the Rolling Pool Upgrade wizard checks that the following actions have been taken, you may choose toperform them before you begin:

Empty the CD/DVD drives of the VMs in the pool(s).Disable HA .Disable WLB.


QUESTION 15An administrator needs to upgrade the existing XenServer pool consisting of four hosts to version 6.0.

When can the administrator use the rolling pool upgrade wizard?

A. When upgrading from XenServer 5.6 or laterB. When XenServer workload balancing is enabledC. When the XenServer installation media is unavailableD. When there are at least three XenServer hosts in the pool

Correct Answer: ASection: (none)Explanation


7.1. Rolling Pool UpgradesWith XenServer, you can perform rolling pool upgrades. A rolling upgrade allows you to upgrade all of the hostsin a pool in such a way that services and resources offered by the pool are available throughout the upgradeprocess. This upgrade method keeps critical VMs running by enabling you to live migrate them to other hostsinthe pool and then to upgrade one host at a time. This process takes only one XenServer host offline at a time.

Important:Rolling Pool Upgrade should not be used with Boot from SAN environments.

Note:The Rolling Pool Upgrade wizard is included in the latest version of XenCenter and intendedfor those upgrading from XenServer version 5.6 or later to the current version of XenServer.

Warning:If you are upgrading pools (from version 5.6 or later to the current version of XenServer) thatcontain Citrix StorageLink Gateway SRs, note that only the following adapters are supported:NetApp and Dell EqualLogic . If the pool contains VMs running on any other types of CitrixStorageLink Gateway SRs, do not upgrade the pool.

While the Rolling Pool Upgrade wizard checks that the following actions have been taken, you may choose toperform them before you begin:

Empty the CD/DVD drives of the VMs in the pool(s).Disable HA.Disable WLB.


QUESTION 16Scenario: An administrator needs to add memory modules to all hosts in a pool. The pool consists of threeXenServer hosts with high availability enabled. High availability is able to tolerate one host failure.

Which action must the administrator take to ensure that another host will be assigned as pool master before thecurrent pool master memory is upgraded?

A. Disable multipathing.B. Put the XenServer host into maintenance mode.C. Run the xe host-emergency-ha-disable command.D. Run the xe pool-emergency-transition-to-master command.

Correct Answer: BSection: (none)

Explanation


QUESTION 17An administrator needs to perform maintenance on a XenServer host that is the pool master and that has highavailability enabled.

Which two commands would the administrator have to use to prepare the XenServer host for maintenance?(Choose two.)

A. host-disableB. host-evacuateC. host-shutdown-agentD. host-management-disableE. host-emergency-ha-disable



3.7. Preparing a Pool of XenServer Hosts for Mainte nanceBefore performing maintenance operations on a XenServer host that is part of a resource pool, you shoulddisableit (which prevents any VMs from being started on it), then migrate its VMs to another XenServer host in thepool.

This can most readily be accomplished by placing the XenServer host into Maintenance mode usingXenCenter.See the XenCenter Help for details.

Note:Placing the master host into maintenance mode will result in the loss of the last 24hrs of RRDupdates for offline VMs. This is because the backup synchronization occurs every 24hrs.

Warning:Citrix highly recommends rebooting all XenServers prior to installing an update and thenverifying their configuration. This is because some configuration changes only take effectwhen a XenServer is rebooted, so the reboot may uncover configuration problems that wouldcause the update to fail.

To prepare a XenServer host in a pool for maintenan ce operations using the CLI

1. Run the command

xe host-disable uuid=<xenserver_host_uuid >xe host-evacuate uuid=<xenserver_host_uuid >

This will disable the XenServer host and then migrate any running VMs to other XenServer hosts in the pool.

2. Perform the desired maintenance operation.

3. Once the maintenance operation is completed, enable the XenServer host:

xe host-enable

Restart any halted VMs and/or resume any suspended VMs.

3.9.4. Shutting Down a host When HA is EnabledWhen HA is enabled special care needs to be taken when shutting down or rebooting a host to prevent the HAmechanism from assuming that the host has failed. To shutdown a host cleanly in an HA-enabled environment,first disable the host , then evacuate the host and finally shutdown the host using either XenCenter or theCLI. To shutdown a host in an HA-enabled environmentá on the command line:

xe host-disable host=<host_name>xe host-evacuate uuid=<host_uuid>xe host-shutdown host=<host_name>


QUESTION 18Scenario: An administrator needs to change the pool master to prepare for maintenance activities during theevening. High availability is currently enabled.

Using the XenCenter Console, what must the administrator do to change the pool master?

A. Disable high availability.B. Configure workload balancing.C. Enable virtual machine protection policy.D. Enter maintenance mode on the pool master.



2.2.3.5. To Change a Subject's RBAC Role:To change a user's role it is necessary to remove them from their existing role, and add them to a new role:

1. Run the commands:xe subject-role-remove uuid=<subject uuid> role-name= <role_name_to_remove>

xe subject-role-add uuid=<subject uuid > role-name= <role_name_to_add >


QUESTION 19Scenario: An administrator realizes that the XenServer pool master has experienced an unrecoverable issueand crashed over the weekend. High availability is currently disabled.

Which command must the administrator run on the XenServer CLI of a pool member to recover the XenServerpool?

A. xe pool-ha-enableB. xe pool-recover-slavesC. xe pool-designate-new-masterD. xe pool-emergency-transition-to-master



8.12.2. Master failuresEvery member of a resource pool contains all the information necessary to take over the role of master ifrequired.When a master node fails, the following sequence of events occurs:1. If HA is enabled, another master is elected automatically.2. If HA is not enabled, each member will wait for the master to return.If the master comes back up at this point, it re-establishes communication with its members, and operationreturns to normal.If the master is really dead, choose one of the members and run the command xe pool-emergency-transitionto-master on it. Once it has become the master, run the command xe pool-recover-slaves and the memberswill now point to the new master.If you repair or replace the server that was the original master, you can simply bring it up, install the XenServerhost software, and add it to the pool. Since the XenServer hosts in the pool are enforced to be homogeneous,there is no real need to make the replaced server the master.When a member XenServer host is transitioned to being a master, you should also check that the default poolstorage repository is set to an appropriate value. This can be done using the xe pool-param-list command andverifying that the default-SR parameter is pointing to a valid storage repository.

A.4.16.6. pool-emergency-transition-to-master

pool-emergency-transition-to-master

Instruct a member XenServer host to become the pool master. This command is only accepted by theXenServerhost if it has transitioned to emergency mode, mean ing it is a member of a pool whose master hasdisappearedfrom the network and could not be contacted for som e number of retries .Note that this command may cause the password of the host to reset if it has been modified since joining thepool

A.4.16.2. pool-designate-new-master

pool-designate-new-master host-uuid=<UUID of member XenServer host to become newmaster >

Instruct the specified member XenServer host to become the master of an existing pool. This performs anorderlyhand over of the role of master host to another host in the resource pool. This command only works whenthecurrent master is online, and is not a replacement for the emergency mode commands.

A.4.16.7. pool-ha-enable

pool-ha-enable heartbeat-sr-uuids=<SR_UUID_of_the_Heartbeat_SR >

Enable High Availability on the resource pool, using the specified SR UUID as the central storage heartbeatrepository.

A.4.16.10. pool-recover-slaves

pool-recover-slaves

Instruct the pool master to try and reset the master address of all members currently running in emergencymode. This is typically used after pool-emergency-transition-to-master has been used to set one of themembersas the new master.


QUESTION 20Scenario: An administrator needs to install Windows Server 2008 R2 on a new virtual machine. The WindowsServer 2008 R2 ISO file is located on a Windows share.

Which storage repository does the administrator need to create to be able to mount the ISO file to the newvirtual machine?

A. CIFSB. iSCSIC. NFS ISOD. StorageLink


Explanation/Reference:

Exam B

QUESTION 1Scenario: An administrator needs to enable high availability for a configured pool. At the last screen in thewizard the administrator notices that the maximum number of server failures that high availability can protect is0.

Click the Exhibit button to view a screenshot of the wizard.

How can the administrator correct this issue?

A. Update XenCenter.B. Upload a valid XenServer license.C. Configure a heartbeat storage repository.D. Add a second identical XenServer host to the pool.



QUESTION 2An administrator should enable high availability on a XenServer pool when __________. (Choose the correctoption to complete the sentence.)

A. additional backup of virtual machines is neededB. workload balancing between servers in a pool is neededC. application(s)/server(s) are accessed 24 hours a day, 7 days a weekD. virtual machines hosted on a pool need access to iSCSI shared storage



QUESTION 3Scenario: An environment, which consists of two XenServer pools, is used to host a web server environment.Pool Two contains only web servers and is used only during peak load. Pool One contains authentication andweb servers. An administrator must ensure that access to the web servers is available at all times.

What is the minimum requirement to achieve this?

A. Enable failover on Pool Two.B. Enable high availability on Pool One.C. Enable workload balancing on Pool Two.D. Enable Active Directory authentication on Pool One.



QUESTION 4Scenario: An administrator needs to ensure that critical virtual machines are restarted automatically in the eventof a host failure. It is critical that virtual machines are restarted in the correct order.

What must the administrator do to configure this?

A. Set required virtual machines to protected.B. Enable a vApp for the required virtual machines.C. Apply workload balancing to the required virtual machines.D. Configure virtual machine properties to "Auto start" on server startup.



8.8. vApps

A vApp is logical group of one or more related Virtual Machines (VMs) which can be started up as a singleentity in the event of a disaster. When a vApp is started, the VMs contained within th e vApp will start in auserpredefined order, to allow VMs which depend upon on e another to be automatically sequenced . Thismeansthat an administrator no longer has to manually sequence the startup of dependant VMs should a whole servicerequire restarting (for instance in the case of a software update). The VMs within the vApp do not have to resideon one host and will be distributed within a pool using the normal rules. The vApp functionality is particularlyuseful in the Disaster Recovery situation where an Administrator may choose to group all VMs which reside onthe same Storage Repository, or which relate to the same Service Level Agreement (SLA).


QUESTION 5What can the administrator create to configure a high availability plan for a group of mission critical virtualmachines in a single pool?

A. SiteB. vAppC. FolderD. Secondary Site



QUESTION 6An administrator needs to configure dynamic memory control (DMC) for Microsoft Windows XP SP2 virtualmachines in the XenServer pool.

What must the administrator do before DMC can be configured on the virtual machines?

A. Update the static memory range.B. Upgrade to a XenServer Platinum license.C. Upgrade the virtual machines to Microsoft Windows XP SP3.D. Run the param-name=memory-static - {min, max} command.



6.1.6. Supported Operating Systems

Citrix supports only certain guest memory configurations. The range of supported configurations depends ontheguest operating system in use. XenServer does not prevent administrators from configuring guests to exceedthesupported limit.

XP SP3 x86 ≥ 256 MB ≤ 4 GB

Server 2003 SP2 x86 ≥ 256 MB ≤ 64 GBx64 ≥ 256 MB ≤ 128 GB

Server 2008 SP2 x86 ≥ 512 MB ≤ 64 GBx64 ≥ 512 MB ≤ 128 GB

Server 2008 R2(+SP1)x64 ≥ 512 MB ≤ 128 GB

Vista SP2 x86 ≥ 1 GB ≤ 4 GB

Microsoft Windows 7 (+SP1) x64 ≥ 2 GB ≤ 128 GBx86 ≥ 1 GB ≤ 4 GB

QUESTION 7Scenario: An administrator is trying to start two new virtual machines in a XenServer resource pool in whichseveral virtual machines are already running. However, the virtual machines will NOT start.

What should the administrator do to get the two new virtual machines to start?

A. Disable XenServer Tools.B. Configure workload balancing.C. Enable dynamic memory control.D. Assign virtual machines to a vApp.



6.1. What is Dynamic Memory Control (DMC)?

XenServer DMC works by automatically adjusting the memory of running VMs, keeping the amount of memoryallocated to each VM between specified minimum and maximum memory values, guaranteeing performanceand permitting greater density of VMs per server .

Without DMC, when a server is full, starting further VMs will fail with "out of memory" errors: to reduce theexisting VM memory allocation and make room for more VMs you must edit each VM's memory allocation andthen reboot the VM. With DMC enabled, even when the server is full, Xen Server will attempt to reclaimmemoryby automatically reducing the current memory alloca tion of running VMs within their defined memoryranges .

Note:Dynamic Memory Control is only available for XenServer Advanced or higher editions.

QUESTION 8Scenario: An administrator needs to increase the maximum memory range from 1 GB to 2 GB on a virtualmachine configured with dynamic memory control. The virtual machine runs Windows Server 2008, has

XenServer tools installed, and it is currently in a running state.

What should the administrator consider prior to adjusting the memory configuration of the virtual machine?

A. The XenServer host needs to have enough available memory.B. XenServer workload balancing needs to be enabled on the host.C. The virtual machine needs to be moved to another resource pool.D. The virtual machine needs to be restarted in order for the changes to take effect.



QUESTION 9Which two policy modes must the administrator apply to implement a XenServer workload balancing policy toreduce power consumption and energy costs during off peak hours? (Choose two.)

A. Maximize DensityB. Fixed OptimizationC. Maximize PerformanceD. Scheduled Optimization

Correct Answer: ADSection: (none)Explanation

Explanation/Reference:Citrix XenServer Workload Balancing 6.0 Administrat or's Guide

Adjusting the Optimization ModeWorkload Balancing makes recommendations to rebalance, or optimize, the virtual-machine workload in yourenvironment based on a strategy for placement you select known as the optimization mode.

Workload Balancing lets you chose from two optimization modes:

• Maximize Performance . (Default.) Workload Balancing attempts to spread workload evenly across allphysical

hosts in a resource pool. The goal is to minimize CPU, memory, and network pressure for all hosts. WhenMaximize Performance is your placement strategy, Workload Balancing recommends optimization when ahostreaches the High threshold.

• Maximize Density . Workload Balancing attempts to minimize the number of physical hosts that must beonline

by consolidating the active virtual machines.

When you select Maximize Density as your placement strategy, you can specify parameters similar to theones in Maximize Performance. However, Workload Balancing uses these parameters to determine how itcanpack virtual machines onto a host. When Maximize Density is your placement strategy, Workload Balancingrecommends consolidation optimizations when a virtual machine reaches the Low threshold.

Workload Balancing also lets you apply these optimization modes all of the time, Fixed, or switch betweenmodes

for specified time periods, Scheduled:

• Fixed optimization modes set Workload Balancing to a specific optimization behavior—either to try to createthe best performance or the highest density—at all times.

• Scheduled optimization modes let you schedule for Workload Balancing to apply different optimizationmodesdepending on the time of day. For example, you might want to configure Workload Balancing to optimize forperformance during the day when you have users connected and then, to save energy, specify forWorkloadBalancing to optimize for Maximum Density at night.

When you configure Scheduled optimization modes, Workload Balancing automatically changes to theoptimization mode at the beginning of the time period you specified. You can configure Everyday, Weekdays,Weekends, or individual days. For the hour, you select a time of day.


QUESTION 10Scenario: An administrator needs to upgrade the memory of a XenServer host. Business requirements statethat this task can only be done during business hours.

Which two steps must the administrator take before shutting down a XenServer host in an environment that hashigh availability enabled without affecting performance? (Choose two.)

A. Disable the host.B. Evacuate the host.C. Reset the pool master.D. Disable high availability.



3.9.4. Shutting Down a host When HA is EnabledWhen HA is enabled special care needs to be taken when shutting down or rebooting a host to prevent the HAmechanism from assuming that the host has failed. To shutdown a host cleanly in an HA-enabled environment,first disable the host , then evacuate the host and finally shutdown the host using either XenCenter or theCLI. To shutdown a host in an HA-enabled environmentá on the command line:

xe host-disable host=<host_name>xe host-evacuate uuid=<host_uuid>xe host-shutdown host=<host_name>


QUESTION 11Which two policy modes must the administrator apply to implement a XenServer workload balancing policy tohelp reduce power consumption and energy costs during all hours? (Choose two.)

A. Maximize DensityB. Fixed OptimizationC. Maximize PerformanceD. Scheduled Optimization


Explanation/Reference:Citrix XenServer Workload Balancing 6.0 Administrat or's Guide

Adjusting the Optimization ModeWorkload Balancing makes recommendations to rebalance, or optimize, the virtual-machine workload in yourenvironment based on a strategy for placement you select known as the optimization mode.

Workload Balancing lets you chose from two optimization modes:

• Maximize Performance . (Default.) Workload Balancing attempts to spread workload evenly across allphysical

hosts in a resource pool. The goal is to minimize CPU, memory, and network pressure for all hosts. WhenMaximize Performance is your placement strategy, Workload Balancing recommends optimization when ahostreaches the High threshold.

• Maximize Density . Workload Balancing attempts to minimize the number of physical hosts that must beonline

by consolidating the active virtual machines.

When you select Maximize Density as your placement strategy, you can specify parameters similar to theones in Maximize Performance. However, Workload Balancing uses these parameters to determine how itcanpack virtual machines onto a host. When Maximize Density is your placement strategy, Workload Balancingrecommends consolidation optimizations when a virtual machine reaches the Low threshold.

Workload Balancing also lets you apply these optimization modes all of the time, Fixed, or switch betweenmodesfor specified time periods, Scheduled:

• Fixed optimization modes set Workload Balancing to a specific optimization behavior—either to tryto createthe best performance or the highest density—at all times.

• Scheduled optimization modes let you schedule for Workload Balancing to apply different optimizationmodesdepending on the time of day. For example, you might want to configure Workload Balancing to optimize forperformance during the day when you have users connected and then, to save energy, specify for WorkloadBalancing to optimize for Maximum Density at night.

When you configure Scheduled optimization modes, Workload Balancing automatically changes to theoptimization mode at the beginning of the time period you specified. You can configure Everyday, Weekdays,Weekends, or individual days. For the hour, you select a time of day.


QUESTION 12Which two steps should an administrator take to back up the configuration of a virtual machine in XenServer ona regular basis? (Choose two.)

A. Schedule virtual machine metadata.B. Access the resource pool configuration.C. Access the backup, restore and update option.

D. Configure a scheduled snapshot of the virtual machine.

Correct Answer: ACSection: (none)Explanation

Explanation/Reference:Backup and restore using xsconsoleWhen a metadata backup is first taken, a special backup VDI is created on a SR. This VDI has an ext3filesystem that stores the following versioned backups:

• A full pool-database backup.• Individual VM metadata backups, partitioned by the SRs in which the VM has disks.• SR-level metadata which can be used to recreate the SR description when the storage is reattached.

In the menu-driven text console on the XenServer host, there are some menu items under the Backup,Update and Restore menu which provide more user-friendly interfaces to these scripts. The operationsshould only be performed on the pool master. You can use these menu items to perform 3 operations:

• Schedule a regular metadata backup to the default pool SR, either daily, weekly or monthly. This willregularly rotate metadata backups and ensure that the latest metadata is present for that SR without anyuser intervention being required.

• Trigger an immediate metadata backup to the SR of your choice. This will create a backup VDI if necessary,and attach it to the host and backup all the metadata to that SR. Use this option if you have madesome changes which you want to see reflected in the backup immediately.

• Perform a metadata restoration operation. This will prompt you to choose an SR to restore from, and thenthe option of restoring only VM records associated with that SR, or all the VM records found (potentiallyfrom other SRs which were present at the time of the backup). There is also a dry run option to see whichVMs would be imported, but not actually perform the operation.

For automating this scripting, there are some commands in the control domain which provide an interfaceto metadata backup and restore at a lower level than the menu options:

• xe-backup-metadata provides an interface to create the backup VDIs (with the -c flag), and also to attachthe metadata backup and examine its contents.

• xe-restore-metadata can be used to probe for a backup VDI on a newly attached SR, and also selectivelyreimport VM metadata to recreate the associations between VMs and their disks.

QUESTION 13Which action must an administrator take to configure unattended backups of virtual machine configurations?

A. Schedule virtual machine metadata.B. Schedule a virtual machine snapshot.C. Configure virtual machine protection policies.D. Configure a script for exporting virtual machines.











QUESTION 14Which command should the administrator use to back up XenServer pool metadata regularly?

A. xe pool-param-getB. xe pool-sync-databaseC. xe pool-dump-databaseD. xe pool-enable-local storage caching


Explanation/Reference:XenServer 6.1.0 Administrator's Guide

8.9.1. Backing up Virtual Machine metadata

XenServer hosts use a database on each host to store metadata about VMs and associated resources such asstorage and networking. When combined with storage repositories, this database forms the complete view of allVMs available across the pool. Therefore it is important to understand how to backup this database in order torecover from physical hardware failure and other disaster scenarios.

This section first describes how to backup metadata for single-host installations, and then for more complexpoolsetups.

8.9.1.1. Backing up single host installationsUse the CLI to backup the pool database. To obtain a consistent pool metadata backup file, run pool-

dumpdatabaseon the XenServer host and archive the resulting file. The backup file will contain sensitive authenticationinformation about the pool, so ensure it is securely stored.

8.9.1.2. Backing up pooled installationsIn a pool scenario, the master host provides an authoritative database that is synchronously mirrored to all themember hosts in the pool. This provides a degree of built-in redundancy to a pool; the master can be replacedby any member since each of them has an accurate version of the pool database. Please refer to the XenServerAdministrator's Guide for more information on how to transition a member into becoming a master host.

This level of protection may not be sufficient; for example, if your shared storage containing the VM data isbackedup in multiple sites, but your local server storage (containing the pool metadata) is not. To fully recreate a poolgiven just a set of shared storage, you must first backup the pool-dump-database file on the master host, andarchive this file.


QUESTION 15Scenario: An administrator needs to ensure that the XenServer pool database in a two-server pool is highlyavailable. However, one of the XenServer hosts has failed and is NOT recoverable. The administrator nowmust re-establish high availability using a new host. The existing host has taken the master role.

Which step should the administrator take to recover the backup pool information to the new XenServer hostand ensure that it is highly available with the existing XenServer master?

A. Add the new host to the existing pool.B. Restore the pool metadata to the new host.C. Restore the pool metadata to the running host.D. Create a new pool and restore the metadata to the new host.



8.12.2. Master failuresEvery member of a resource pool contains all the information necessary to take over the role of master ifrequired.When a master node fails, the following sequence of events occurs:

1. If HA is enabled, another master is elected automatically.

2. If HA is not enabled, each member will wait for the master to return.

If the master comes back up at this point, it re-establishes communication with its members, and operationreturns to normal.

If the master is really dead, choose one of the members and run the command xe pool-emergency-transitionto-master on it. Once it has become the master, run the command xe pool-recover-slaves and the memberswill now point to the new master.

If you repair or replace the server that was the or iginal master, you can simply bring it up, install theXenServer

host software, and add it to the pool . Since the XenServer hosts in the pool are enforced to behomogeneous,there is no real need to make the replaced server the master.


QUESTION 16Scenario: After a host failure, an administrator rebuilt the host and restored the XenServer pool database.However, all virtual machines are registered as suspended.

Which command can the administrator use to correct the situation?

A. xe vm-reboot vm=vm_nameB. xe vm-shutdown vm=vm_nameC. xe vm-unpause vm=vm_name --multipleD. xe vm-reset-powerstate vm=vm_name -force



A.4.27.28. vm-reset-powerstate

vm-reset-powerstate [<vm-selector>=<vm_selector_value>...] {force=true}


This is an advanced command only to be used when a member host in a pool goes down. You can use thiscommand to force the pool master to reset the power -state of the VMs to be halted . Essentially thisforces thelock on the VM and its disks so it can be subsequently started on another pool host. This call requires the forceflag to be specified, and fails if it is not on the command-line.


QUESTION 17An administrator needs to back up the metadata of a XenServer pool on a scheduled basis to replicate to theDisaster Recovery site.

Which two steps must the administrator take to backup the pool? (Choose two.)

A. Open XenCenter.B. Open the XenServer console.C. Configure scheduled snapshots.D. Select Backup, Restore and Update.E. Select Resource Pool Configuration.

Correct Answer: BDSection: (none)Explanation










QUESTION 18Scenario: An administrator is making changes to a stand-alone XenServer host and has taken it offline. Thevirtual machines on that host will be restored to another host.

The administrator needs to __________the virtual machines to meet the requirements of the scenario. (Choosethe correct option to complete the sentence.)

A. copyB. exportC. protectD. migrate



6.1.1. XenMotion

XenMotion is available in all versions of XenServer and allows you to move a running VM from one host toanotherhost, when the VMs disks are located on storage shared by both hosts. This allows for pool maintenancefeaturessuch as Workload Balancing (WLB), High Availability (HA), and Rolling Pool Upgrade (RPU) to automaticallymoveVMs. These features allow for workload levelling, infrastructure resilience, and the upgrade of server software,without any VM downtime.

Note:Storage can only be shared between hosts in the sam e pool. As a result VMs can only bemigrated to hosts in the same pool .

A stand alone server is, in effect a single server pool

This requires the VMs to be exported from the origi nal server and imported into the new server


QUESTION 19Scenario: An administrator of a XenServer pool needs to ensure that virtual machines will be available in theevent of a disaster. A backup XenServer implementation is in place in another location; however, there is NOreplication available.

In preparation for disaster recovery, which step should the administrator perform?

A. Run the vm-export command.B. Run the vm-migrate command.C. Take a snapshot of the virtual machines.D. Install backup agents on the virtual machines.



8.9. Backing Up and Restoring XenServer Hosts and V Ms

To backup a VM1. Ensure that the VM to be backed up is offline.2. Run the command:

xe vm-export vm=<vm_uuid> filename=<backup>

Note:This backup also backs up all of the VM data. When importing a VM, you can specify thestorage mechanism to use for the backed up data.

Warning:Because this process backs up all of the VM data, it can take some time to complete.

A.4.27.21. vm-export

vm-export filename=<export_filename >[metadata=<true | false >]

[<vm-selector >=<vm_selector_value >...]

Export the specified VMs (including disk images) to a file on the local machine. Specify the filename to exporttheVM into using the filename parameter. By convention, the filename should have a .xva extension.


QUESTION 20Scenario: An administrator is in the process of updating a database server on a virtual machine and would liketo preserve its current state in case something goes wrong. The virtual machine is being used in a productionenvironment and needs to remain online.

What can the administrator do to meet the requirements of the scenario?

A. Preserve the virtual machine by exporting it to an external drive.B. Enable high availablity to ensure the virtual machine remains online.C. Perform an online backup by taking a snapshot of the virtual machine.D. Make a copy of the virtual machine in case the original needs to be deleted.



8.10. VM Snapshots

XenServer provides a convenient snapshotting mechanism that can take a snapshot of a VM storage andmetadataat a given time. Where necessary, IO is temporarily halted while the snapshot is being taken to ensure that aself consistentdisk image can be captured.

Snapshot operations result in a snapshot VM that is similar to a template. The VM snapshot contains all thestorage information and VM configuration, including attached VIFs, allowing them to be exported and restoredfor backup purposes. Snapshots are supported on all storage types, though for the LVM-based storage typesthestorage repository must have been upgraded if it was created on a previous version of XenServer and thevolumemust be in the default format (type=raw volumes cannot be snapshotted).

The snapshotting operation is a 2 step process:

• Capturing metadata as a template.• Creating a VDI snapshot of the disk(s).

Three types of VM snapshots are supported: regular, quiesced, and snapshot with memory


Exam C

QUESTION 1The development team requires that a virtual machine be restored to the state it was on the previous day, butwill need parallel access to the current state of the virtual machine.

What can an administrator do to meet the requirements of the scenario?

A. Revert the virtual machine back to the previous snapshot and start it.B. Create a new virtual machine from the previous snapshot and start it.C. Make a copy of the virtual machine, revert it to the previous snapshot and start it.D. Take a snapshot of the current state of the virtual machine and revert it to the previous snapshot.



QUESTION 2Scenario: An administrator needs to restore a virtual machine from a snapshot. All virtual machines on theXenServer host are stored on a NFS storage repository.Which two methods can the administrator take to restore the virtual machine? (Choose two.)

A. Use the xe snapshot-revert command.B. Restore the NFS share from a previous snapshot.C. Restore the virtual machine using the XenCenter snapshot module.D. Use the XenServer console's "restore virtual machine metadata" function.



QUESTION 3Scenario: An administrator of a pool of XenServers has discovered that NOT all XenServers are showing thesame time in the event logs. NTP is configured and enabled on all XenServers. The servers are in the samelocation and use the same NTP server.

From the console of each XenServer, which command should the administrator type to determine if the dateand time zone of each server is causing the issue?

A. dateB. timeC. timeutilD. tzselect



QUESTION 4Scenario: An administrator is able to connect on some ports of a XenServer and NOT connect on others. TheXenServer responds by indicating that some of the ports are blocked. The interface in question is the firstEthernet NIC.

Which two commands should the administrator run from the XenServer console to find out if any ports areblocked? (Choose two.)

A. ip addr -rB. ethtool -AlC. netreport -rD. iptables -nLE. tcpdump -i eth0

Correct Answer: DESection: (none)Explanation


QUESTION 5Scenario: An administrator configured link aggregation on two switch ports that are connected to the XenServernetwork interface card (NIC) bond. NO network flow is possible on the NIC bond.

How can the administrator resolve this networking issue?

A. Remove the NIC bond.B. Change the NIC bond to active/active.C. Configure link aggregation with failover.D. Remove link aggregation from the switch ports.E. Ensure that the IP address is correct on the NIC bond.



QUESTION 6Scenario: Users are NOT able to log into XenCenter using their Active Directory credentials. The administratorchecked to ensure that the XenServer host exists as a valid computer object in Active Directory.

What should the administrator do to ensure that users are able to authenticate successfully using XenCenter?

A. Recreate the XenServer host computer object in Active Directory.B. Ensure that the XenServer host and domain controller are in the same time zone.C. Check that the time is synchronized between Active Directory and the XenServer host.D. Set up the correct delegation on the XenServer host computer object in Active Directory.



2.1.1. Configuring Active Directory Authentication

• XenServer labels its AD entry on the AD database using its hostname. Therefore, if two XenServer hosts havethe same hostname and are joined to the same AD domain, the second XenServer will overwrite the AD entryof the first XenServer, regardless of if they are in the same or in different pools, causing the AD authenticationon the first XenServer to stop working.

• The XenServer hosts can be in different time-zones , as it is the UTC time that is compared. To ensuresynchronization is correct, you may choose to use the same NTP servers for your XenServer pool and theActiveDirectory server.

• Mixed-authentication pools are not supported (that is, you cannot have a pool where some servers in the poolare configured to use Active Directory and some are not).

• The XenServer Active Directory integration uses the Kerberos protocol to communicate with the ActiveDirectory servers. Consequently, XenServer does not support communicating with Active Directory servers thatdo not utilize Kerberos.

• For external authentication using Active Directory to be successful, it is important that the clocks on yourXenServer hosts are synchronized with those on your Active Directory server . When XenServer joins theActiveDirectory domain, this will be checked and authentication will fail if there is too much skew between theservers.


QUESTION 7Scenario: An administrator built four new hosts in an existing XenServer pool that already has multiple hostsconnected to a shared storage over Fibre Channel. The administrator discovered that the new hosts are NOTable to connect to the existing storage repositories.

Which two steps can the administrator take to resolve the issue? (Choose two.)

A. Check the log files.

B. Recreate the storage repositories.C. Verify that the LUNs are mapped and zoned correctly.D. Convert the storage repositories to shared storage repositories.



Incorrect Answers:Recreate the storage repositories.Convert the storage repositories to shared storage repositories.

The question already states that the administrator already has a working pool that is connecting to the SR.

Correct AnswersCheck the log files

Always a good step in fault diagnosis

Verify that the LUNs are mapped and zoned correctly.If the LUNS are not mapped and zoned correctly the initiator (Host) will not be able to see the target(LUN)that the SR is stored on.

QUESTION 8An administrator noticed that a storage repository is unable to attach or be repaired in the XenCenter console.

Which command can the administrator run in the XenServer CLI to reconnect the storage repository?

A. xe sr-scanB. xe sr-probeC. xe pbd-plugD. xe pbd-unplug



A.4.14. PBD Commands

Commands for working with PBDs (Physical Block Devices). These are the software objects through which theXenServer host accesses storage repositories (SRs).

pbd-plug uuid=<uuid_of_pbd>

Attempts to plug in the PBD to the XenServer host. If this succeeds, the referenced SR (and the VDIscontainedwithin) should then become visible to the XenServer host.


QUESTION 9An administrator needs to resolve intermittent host issues related to high availability.

Which two actions can the administrator take to resolve this issue? (Choose two.)

A. Change storage repositories.B. Implement Disaster Recovery.C. Implement workload balancing.D. Change management networks.

Correct Answer: ADSection: (none)Explanation

Explanation/Reference:3.8.1.3. Host Fencing

If a server failure occurs such as the loss of network connectivity or a problem with the control stackis encountered, the XenServer host self-fences to ensure that the VMs are not running on two serverssimultaneously. When a fence action is taken, the server immediately and abruptly restarts, causing all VMsrunning on it to be stopped. The other servers will detect that the VMs are no longer running and the VMs willbe restarted according to the restart priorities assign to them. The fenced server will enter a reboot sequence,and when it has restarted it will try to re-join the resource pool.

3.8.2. Configuration RequirementsNote:Citrix recommends that you enable HA only in pools that contain at least 3 XenServer hosts.For details on how the HA feature behaves when the heartbeat is lost between two hosts ina pool, see the Citrix Knowledge Base article CTX129721.

To use the HA feature, you need:Shared storage, including at least one iSCSI, NFS or Fibre Channel LUN of size 356MB or greater- the heartbeat SR. The HA mechanism creates two volumes on the heartbeat SR:4MB heartbeat volume

Used for heartbeating.

256MB metadata volumeStores pool master metadata to be used in the case of master failover.

Note:For maximum reliability, Citrix strongly recommends that you use a dedicated NFS or iSCSIstorage repository as your HA heartbeat disk, which must not be used for any other purpose.If you are using a NetApp or EqualLogic SR, manually provision an NFS or iSCSI LUN on the array to useas theheartbeat SR.

A XenServer pool (this feature provides high availability at the server level within a single resource pool).XenServer Advanced edition or higher on all hosts.Static IP addresses for all hosts.

QUESTION 10Scenario: An administrator is planning to upgrade the RAM in a XenServer host. Due to business restrictions,the host must be shut down during normal business hours. High availability is enabled in the XenServerresource pool.

Which step does the administrator need to take before shutting down the XenServer host to allow the virtual

machines to run after the host is shut down?

A. Disable high availability.B. Export the virtual machines.C. Place the host in maintenance mode.D. Copy the virtual machines to another host.



3.7. Preparing a Pool of XenServer Hosts for Mainte nance

Before performing maintenance operations on a XenServer host that is part of a resource pool, you shoulddisableit (which prevents any VMs from being started on it), then migrate its VMs to another XenServer host in thepool.

This can most readily be accomplished by placing the XenServer host into Maintenance mode usingXenCenter.See the XenCenter Help for details.


QUESTION 11Scenario: An administrator has noticed that all storage repositories in XenCenter are shown as using 0 bytes ofspace. The administrator has determined that the XAPI database must be in sync with the local VDIs presentedon the underlying storage substrate.

Which command should the administrator run to resolve this issue?

A. xe sr-scanB. xe sr-probeC. xe sr-forgetD. xe sr-introduce



A.4.18.9. sr-scansr-scan uuid=<sr_uuid>

Force an SR scan, syncing the xapi database with VDIs present in the underlying storage substrate.


QUESTION 12Scenario: An administrator receives a change request to enable high availability in a resource pool consisting ofsix XenServer hosts. When the administrator is executing the change request, an error message indicates

there is an issue with enabling high availability.

What could be causing this issue?

A. NTP is NOT specified.B. Hosts have different CPUs.C. Active Directory authentication is NOT configured.D. The storage repository disk space for heart-beat is insufficient.



3.8.2. Configuration RequirementsNote:Citrix recommends that you enable HA only in pools that contain at least 3 XenServer hosts.For details on how the HA feature behaves when the heartbeat is lost between two hosts ina pool, see the Citrix Knowledge Base article CTX129721.

To use the HA feature, you need:Shared storage, including at least one iSCSI, NFS o r Fibre Channel LUN of size 356MB or greater -the heartbeat SR. The HA mechanism creates two volumes on the heartbeat SR:4MB heartbeat volume

Used for heartbeating.

256MB metadata volumeStores pool master metadata to be used in the case of master failover.

Note:For maximum reliability, Citrix strongly recommends that you use a dedicated NFS or iSCSIstorage repository as your HA heartbeat disk, which must not be used for any other purpose.If you are using a NetApp or EqualLogic SR, manually provision an NFS or iSCSI LUN on the array to useas theheartbeat SR.

A XenServer pool (this feature provides high availability at the server level within a single resource pool).XenServer Advanced edition or higher on all hosts.Static IP addresses for all hosts.


QUESTION 13Scenario: An administrator CANNOT use XenCenter to manage an existing XenServer host in a resource pool.The administrator found that the XenServer host CANNOT communicate properly with XAPI.

What could be causing the communication issue on the failed host?

A. Dom0 is out of space.B. NTP is NOT configured.C. The root password is unknown.D. The host CANNOT connect to Active Directory.

Correct Answer: ASection: (none)

Explanation

Explanation/Reference:One reason the XAPI service does not start is because your root “/” directory is out of space.

A common scenario is that the XenServer is experiencing a lot of issues that are being logged in the /var/log logfiles

XenServer XAPI Service Does Not Start :


XenServer 6.1.0 Technical FAQ

What is the Control Domain (dom0)?

The Control Domain, also called Domain 0 or dom0, is a secure, privileged VM that runs the XenServermanagement toolstack known as xapi. Besides providing XenServer management functions, dom0 also runsthe physical device drivers for networking, storage etc.

What is xapi, what does it do, is it the same as th e XenAPI?

xapi is the software stack that controls VM lifecycle operations, host and VM networking, VM storage, userauthentication, and allows the management of XenServer resource pools.

xapi provides the publicly documented XenAPI Management Interface which is used by all tools that manageVMs and resource pools.Examples of internal and external tools that make use of the XenAPI include:

XenCenter management GUI xs management console xe command-line interface Automated Workload Balancing virtual appliances Apache Cloudstack Cloud orchestration software


QUESTION 14Scenario: An administrator manages six XenServer hosts in a resource pool in which high availability isenabled. The administrator is notified that host fencing occurred.

Which two reasons could be causing the issue? (Choose two.)

A. CPU utilization reached 90%.B. The resource pool is overcommitted.C. The shared storage repository was disconnected.D. There was a XenServer management network outage.



XenServer High Availability


QUESTION 15An administrator CANNOT use XenCenter to connect to an existing standalone XenServer host that has sixvirtual machines running.


A. NTP is NOT configured.B. The XAPI Service stopped.C. The XenServer DNS configuration is incorrect.D. Communication with Active Directory has been lost.


Explanation/Reference:XAPI or “XenAPI” is the management tool stack used in XenServer.

So for example to talk to XAPI (or the XenServer management interface on a XenServer) – you have to use theXenAPI toolstack. XenCenter does this for example . And each host in a XenServer pool does this too – to talk to the Master in apool.

XAPI is at the heart of XenServer. It manages everything – all the resources in your XenServer environment,

It reads in configs, initializes networking paths, checks licensing, maintains a Database with all this info (theXAPI database), manages Storage Repositories, manages VMs, tracks VM states, manages networking, High Availability andother XenServer hosts in the pool and more……

http://blogs.citrix.com/2011/05/18/so-what-is-xenserver-xapi/

QUESTION 16Scenario: An administrator tries to start a virtual machine on a host that has an NFS storage repository. Thevirtual machine gives the error "This virtual machine needs storage that cannot be seen from the server."

Which action, within XenCenter, can the administrator take on the NFS storage repository to correct this issue?

A. RepairB. ForgetC. DetachD. Set as default



QUESTION 17Scenario: An administrator manages a XenServer resource pool consisting of six XenServer hosts. A WindowsXP virtual machine runs on a shared NFS storage repository. The administrator needs to migrate the Windows

XP virtual machine to another host but CANNOT.

What must the administrator do to migrate the Windows XP virtual machine?

A. Install XenServer Tools on the virtual machine.B. Suspend and then migrate the virtual machine.C. Enable multipathing on the virtual machine hard drive.D. Place the virtual machine on shared Fibre Channel or iSCSI storage repository.



QUESTION 18An administrator of a Provisioning services environment notices that several of the target devices that areconfigured to use a vDisk on the provisioning server are randomly failing to start and shut down.

What should the administrator check to prevent this issue from occurring?

A. The SOAP Service is running.B. High availability is enabled on the vDisks.C. The target devices are configured to start up from hard disk.D. All network switch ports have spanning tree protocol disabled.



QUESTION 19Scenario: An administrator is troubleshooting a Provisioning services environment. After the administratorconfigured a new version of the vDisk for 10 identical target devices all running on the same XenServer host,the administrator discovers that only the first target device started with the new vDisk configured. The othernine target devices failed to startup.

What is one of the steps the administrator should take to resolve this issue?

A. Configure the PXE Service.B. Configure the bootstrap file.C. Restart the Stream Service.D. Change the vDisk access mode.


Explanation/Reference:Selecting a vDisk Access Mode

The vDisk access mode options include:

Standard Image ModeStandard Image mode allows multiple target devices to stream from a single vDiskimage at the same time; reducing the amount of vDisk management and reducingstorage requirements.

Private Image ModeA vDisk that is in Private image mode closely models how a computer uses a regularhard drive. That is, only one target device can use a Private Image vDis k at a time.

QUESTION 20Scenario: An administrator is troubleshooting a Provisioning services farm that consists of two identical serversand 100 identical target devices. From the Provisioning Services Console the administrator notices that one ofthe provisioning servers has twice the amount of target devicesconnected compared with the other provisioning server.

The vDisk used and the provisioning servers are configured to use high availability and load balancing.

What should the administrator check to correct load balancing?

A. Power RatingB. Bootstrap optionsC. vDisk access modeD. Offline database support



Exam D

QUESTION 1Scenario: An administrator manages an environment with 200 private virtual machine images that need to beupdated. Snapshots are NOT being used and the virtual machines have been customized by the users.

Which step must the administrator take to update these images?

A. Enable automatic updates.B. Merge differencing disk files.C. Change the vDisk access mode.D. Update each of the vDisks individually.



QUESTION 2Scenario: An administrator created a single vDisk in the Provisioning Services Console that will be delivered tomultiple target devices. The operating system must save user changes to applications.

Which two options did the administrator select while preparing the vDisk? (Choose two.)

A. Private Image modeB. Cache in Device RAMC. Standard Image modeD. Cache on Hard Drive Persistent


Explanation/Reference:Citrix ® Provisioning Services ™ 6.0 Administrator's Guide

Configuring the vDisk Access ModeUse the Console to select from the following vDisk access modes:

Private Image – Select this mode if a vDisk is only used by a single target device (read/write access isenabled).Standard Image – Select this mode if a vDisk is shared by multiple target devices (writecache optionsenabled).

Cache on Device Hard DriveWrite cache can exist as a file in NTFS format, located on the target-device’s harddrive. This write cache option frees up the Provisioning Server since it does not have toprocess write requests and does not have the finite limitation of RAM.The hard drive does not require any additional software to enable this feature.

Note: The write cache file is temporary unless the vDisk mode is set to DifferenceDisk Image mode.

Cache Device Hard Drive Persisted (experimental pha se only)The same as Cache on device hard drive, except cach e persists . At this time, this writecache method is an experimental feature only, and is only supported for NT6.1 or later(Windows 7 and Windows 2008 R2 and later). This method also requires a differentbootstrap. To select the correct bootstrap from the Console, right-clcik on the

Provisioning Server, select Configure Bootstrap . On the General tab, click on the dropdownBootstrap file option, then choose CTXBP.BIN. Citrix highly recommends that thelocal HDD (client side) drive has enough free space to store the entire vDisk.

QUESTION 3An administrator needs to modify an application contained within a vDisk that is currently being used by multipletarget devices.

Which option must the administrator select on the vDisk in order to modify the application?

A. Cache on ServerB. Private Image modeC. Standard Image modeD. Cache on Device Hard Disk



QUESTION 4An administrator needs to add a new group of similar computers to an existing Provisioning services farm.

Which type of resource could the administrator create in Provisioning services?

A. FarmB. StoreC. Target DeviceD. Device Collection



QUESTION 5An administrator has two datacenters, each of which has its own storage that can only be accessed by hoststhat are in the same datacenter.

What could the administrator create to ensure that each host can only access its assigned storage?

A. SiteB. StoreC. Target deviceD. Device collection



QUESTION 6An administrator needs to create a template from an existing virtual machine that is installed with WindowsServer 2008.


The administrator needs to __________ the virtual machine before converting it into a template. (Choose thecorrect option to complete the sentence.)

A. copyB. exportC. sysprepD. snapshot



QUESTION 7An administrator is planning to apply an update that has already been downloaded to a XenServer host inproduction.

What is the next step that the administrator needs to take in the update process?

A. Restart the host.B. Generate the UUID for the patch.C. Specify the UUIDs of the host and the patch.D. Shut down, suspend or migrate the virtual machines running on the host.



QUESTION 8What is the last step required to enable the offline database within Provisioning services?

A. Enable auditing.B. Enable automatic merge.C. Restart the SOAP Service.D. Restart the Stream Service.



Offline Database Support

The Offline Database Support option allows Provisioning Servers to use a snapshot ofthe Provisioning Services database in the event that the connection to the database islost.

Note: This option is disabled by default and is only recommended for use with astable farm running in production. It is not recommended when running an evaluationenvironment or when reconfiguring farm components ‘on the fly’. Only a farmadministrator can set this option.

When offline database support is enabled on the farm, a snapshot of the database iscreated and initialized at server startup. It is then continually updated by the StreamProcess. If the database becomes unavailable, the Stream Process uses the snapshot toget information about the Provisioning Server and the target devices available to theserver; this allows Provisioning Servers and target devices to remain operational.

However, when the database is offline, Provisioning Services management functions andthe Console become unavailable.

When the database connection becomes available, the Stream Process synchronizes anyProvisioning Server or target device status changes made to the snapshot, back to thedatabase.

Enabling Offline Database Support

To enable the Offline Database Support option:

1. In the Console tree, right-click on the Farm, then select Properties . The Farm Properties dialog appears.2. On the Options tab, check the checkbox next to Offline Database Support .3. Restart Stream services.

QUESTION 9Scenario: An administrator is configuring a distributed Provisioning services farm, which will span six remotesites. All remote sites are connected by WAN links and the Provisioning services SQL database in the maindatacenter.

Which option could the administrator configure to achieve high availability of Provisioning services during anetwork outage?

A. Database MirroringB. vDisk Load BalancingC. Offline Database SupportD. Provisioning Server high availability



QUESTION 10Scenario: An administrator needs to configure a shared storage repository for a XenServer pool. The storageteam has provisioned 500 GB of storage space on a NetApp SAN to be used for the XenServer storagerepository. Thin provisioning and data deduplication were defined as requirements for the storage repositoryand must be enabled using XenCenter.

Which type of storage repository will allow the administrator to meet the specified requirements?

A. NFS VHDB. Hardware HBAC. Software iSCSID. Advanced StorageLink


Explanation/Reference:Thin provisioning and data duplications are options/features available natively within the NetApp SAN. In orderto fully integrate with this a StorageLink SR is required.

What is StorageLink?

Citrix StorageLink™ technology lets your virtual server infrastructures fully leverage all the resources andfunctionality of existing storage systems. StorageLink supports third party storage architectures and deliversdeep integration with leading storage platforms.

Benefits of StorageLink

Improved Management of Storage Fabric and Arrays: Traditionally, fabrics and arrays are managed with their own set of proprietary UIs. StorageLink™ provides easy to use UI wizards to configure and manage your SAN fabric and arrays.

Tight Integration with native features of Storage Arrays: StorageLink™ "talks the language" of the storage array and exposes the native feature set in the storagearray to the Virtualization administrator. Examples of these features are thin provisioning, f ast clones, fastsnapshots etc .

Improved VM Lifecycle Management: StorageLink™ allows the administrator to define hardware and storage profiles for VMs. Storage profiles canthen be linked to storage volumes (LUNs) in storage arrays. The combination of hardware and storage profiles allows administrators to define golden images to enablesubsequent rapid creation of complex workloads leveraging the snapshot and clone capabilities of storagearrays.

http://community.citrix.com/display/xs/Citrix+StorageLink

QUESTION 11Scenario: An administrator purchased a new iSCSI Dell EqualLogic SAN. The administrator is required toconfigure a new storage repository on the XenServer pool and offload intensive tasks such as LUNprovisioning, snapshot and cloning of data to the new SAN.

Which type of storage repository must the administrator create to meet the requirements of this scenario?

A. NFS VHD

B. Hardware HBAC. Software iSCSID. Advanced StorageLink



QUESTION 12An administrator needs to create a network Access Control List for a group of hosts in XenServer.

Which Access Control List should the administrator choose?

A. VMB. VIFC. GlobalD. Resource Pool



QUESTION 13Which Access Control List should the administrator choose to disable port 80 access to network interfaces on avirtual machine?

A. VMB. VIFC. NetworkD. Resource Pool



QUESTION 14An administrator needs to throttle traffic from the virtual print server because it has been impacting all virtualmachines on the network.

On which object should the QoS policy be configured?

A. VMB. GlobalC. ServerD. Network



QUESTION 15Scenario: An administrator needs to remove QoS processing from a virtual machine. The virtual machine isexperiencing performance issues with web traffic in a XenServer environment with a global QoS policy applied.

Which configuration change should the administrator make to satisfy this requirement?

A. Disable inherited QoS policyB. Inherit QoS policy from parentC. Apply a QoS limit of 1000 KbpsD. Disable the VM Access Control List


Explanation/Reference:Citrix XenServer ® 6.1.0 vSwitch Controller User Gu ide

4.6.Configuring QoS. Configuring QoS

For QoS policies, choose from the following options:

• Inherit QoS policy from parent (default): Applies the policy from the higher (i.e., less specific) hierarchy level.This option does not exist at the global level.

• Disable inherited QoS policy: Ignores any policies that are set at higher (i.e., less specific) levels suchthat allVIFs included in this policy level have no QoS conf iguration.

QUESTION 16Scenario: XenServer Pool1 must be configured to provide fault tolerance in case a host fails.Pool1 consists of 10 XenServer hosts.

Which command should the administrator execute to enable fault tolerance?

A. xe pool-param-addB. xe pool-join name=Pool1C. xe pool-ha-enable name=Pool1D. xe pool-ha-enable heartbeat-sr-uuids=<sr_uuid>



A.4.16.7. pool-ha-enable

pool-ha-enable heartbeat-sr-uuids=<SR_UUID_of_the_Heartbeat_SR>

Enable High Availability on the resource pool, using the specified SR UUID as the central storage heartbeatrepository.


QUESTION 17Scenario: A new email virus threat has been publicly announced, but virus definitions are NOT yet available forprotection. An administrator manages the virtual machine hosting the mail server of the company. There areNO redundant mail servers available and mail flow CANNOT be interrupted.

What can the administrator do as a preventive tactic?

A. Preserve the virtual machine by exporting it to an external drive.B. Enable high availablity to ensure the virtual machine remains online.C. Make a copy of the virtual machine in case the original gets infected.D. Perform an online backup by taking a snapshot of the virtual machine.



QUESTION 18An administrator needs to apply an update to a XenServer pool, but needs to control the update path and thevirtual machine migration.

What does the administrator need to do to achieve this?

A. Update all hosts in the pool using the xe CLI.B. Use the Install Update wizard to update the pool.C. Update each host individually starting with the pool master.D. Select manual update mode when updating the pool in XenCenter.



QUESTION 19Scenario: A virtual machine that uses Provisioning services is accidentally deleted by an administrator. Theadministrator creates a new virtual machine from the same template that was used to create the virtualmachine deleted. However, the virtual machine is NOT able to start up from the vDisk.

What must the administrator do to resolve the issue?

A. Assign the correct vDisk to the target device.B. Reconfigure the target device MAC address.C. Configure the target device to start up from vDisk.D. Create a target device for the new virtual machine.


Explanation/Reference:A target Device entry is a machine host name and MAC address.

Creating a new VM from a template will create a machine identical to the one deleted except items such as theMAC address will be unique to that VM (And therefore different from the one deleted)

The recreated Target Device will need the database record amending to include the NEW MAC address beforeit willbe recognized as a valid target within a target device collection and therefore be able to start from the assignedvDisk

QUESTION 20Scenario: An administrator is unable to connect to a resource pool in a XenServer environment in which highavailability is enabled. The administrator discovers that the host is unreachable.

What does the administrator need to do to recover the host?

A. Run the pool-disable command, then the host-shutdown command and then restart the host.B. Run the pool-disable command, then run the pool-emergency-reset-master command and restart the host.C. Run the emergency-ha-disable command, then once the host is restarted, run the pool-ha- enable

command.D. Run the host-evacuate command, then restart the host and run the pool-emergency-transition- to-master

command.



Exam E

QUESTION 1An administrator needs to reconfigure the stream server boot list following a server failure.

How could the administrator ensure the replacement server is included in the stream server boot list?

A. Restart the Stream Service.B. Enable Automatic vDisk updates.C. Update the target device "Boot From" setting.D. Add the IP address of the new server to the ARDBP32.bin file.


Explanation/Reference:ARDBP32.BIN is the Citrix PVS Bootstrap file that is downloaded to the target device on boot from the TFTPserver

Configure Bootstrap Server2. Select Provisioning Servers to use for the boot process:

a. Use the Add button to add additional Provisioning Servers to the list, the Editbutton to edit existing information, or Remove to remove the ProvisioningServer from the list. Use the Move up or Move down buttons to change theProvisioning Server boot preference order.

The maximum length for the server name is 15 characters. Do not enter FQDNfor the server name.

In an HA implementation, at least two Provisioning Servers must be selected asboot servers.

b. Optionally, highlight the IP address of the Provisioning Server that targetdevices will boot from, then click Advanced . The Advanced Stream ServersBoot List appears.

QUESTION 2An administrator configured a Provisioning services environment that consists of three provisioning servers foruse with the DHCP/PXE boot process.

To configure the stream server boot list, the administrator needs to add the IP address __________ in order toinclude the three provisioning servers. (Choose the correct option to complete the sentence.)

A. of each server to the ARDBP32.BIN fileB. and the name of each server in the lmhosts fileC. of each server in the TFTP options of the DHCP serverD. and the name of each server in the hosts file on all of the provisioning servers



QUESTION 3Scenario: An administrator CANNOT use the PXE boot method with the Provisioning services environmentbecause of network limitations. The target devices are running on a XenServer host.

How can the administrator configure the target devices to start up using Provisioning services?

A. Configure the BIOS bootstrap on the server.B. Edit the bootstrap file on the provisioning server.C. Set the target device to start up from the hard disk.D. Create a bootstrap disk with Boot Device Manager.



QUESTION 4Scenario: An administrator configures a bootstrap file with the Manage Boot Devices Utility. The administratorwants to make sure that the target devices in use start successfully. These target devices use drivers that haveseveral timing and startup issues.

Which option must the administrator select during the creation of the bootstrap file to correct these issues?

A. Verbose ModeB. Interrupt Safe ModeC. Network Recovery MethodD. Advanced Memory Support



Configuring Boot Devices• Verbose Mode ; enable/disables the displaying of extensive boot and diagnosticinformation that is helpful when debugging issues.

• Interrupt Safe Mode ; enable/disable for debugging issues, which is sometimesrequired for drivers that exhibit timing or boot be havior problems.

• Advanced Memory Support ; enables/disables the address extensions, to matchyour operating system settings. Select this option to enable the bootstrap towork with newer Windows OS versions (enabled by default). Only disable thissetting on older XP or Windows Server OS 32 bit versions that do not supportPAE, or if your target device is hanging or behaving erratically in early boot phase.

• Network Recovery Method ; select to attempt to restore the networkconnection or to reboot from a hard drive if the target device loses connectionto the Provisioning Server, and how long (in seconds) to wait to make thisconnection.

QUESTION 5Scenario: An administrator is moving a XenServer host from the New York datacenter to the Londondatacenter. During the installation of XenServer, the default NTP settings were selected.

How must the administrator ensure that the XenServer host has the correct time settings?

A. Configure the time in the host BIOS.B. Configure the time zone in the ntp.conf file.C. Change the time zone using the xsconsole.D. Change the NTP servers to the London NTP servers.



QUESTION 6Which two DHCP options must an administrator configure for a target device to start up without PXE using abootstrap file? (Choose two.)

A. 64B. 65C. 66D. 67



QUESTION 7An administrator is deploying Provisioning services in a XenServer environment.

Which DHCP option must the administrator enable so that the target device will retrieve the boot file by namefrom the TFTP server?

A. 64B. 65C. 66D. 67



QUESTION 8Scenario: An administrator is installing Provisioning services which uses PXE for starting virtual machines.DHCP is installed and configured in the environment.

What additional component is required for the PXE environment to start a virtual machine?

A. TFTPB. BootPC. SOAP ServiceD. Boot Device Manager



QUESTION 9Scenario: An administrator has to configure a small scale, isolated Provisioning services test environment. Theadministrator has placed a non-Microsoft DHCP server on the same server as Provisioning services, which isrunning the PXE Service.

Which DHCP option must the administrator configure to enable PXE functionality?

A. 60B. 64C. 66D. 67


Explanation/Reference:PXE does not come with a dedicated boot protocol. It is simply DHCP packets extended with additional DHCPoptions. It’s formerly known as the bootstrap protocol. If a PXE-enabled network card sends out an DHCP discoverpackage, it will add DHCP option 60, which includes the string “PXEClient:Arch:xxxxx:UNDI:yyyzzz”. Then it waits forDHCP offers.

It will only respond if it gets a DHCP offer includ ing option 60 which means: I am PXE capable and able tosend out boot server and boot file information.

A PXE-DHCP Handshake looks like the following:

(DHCP and PXE service run on different machines)

DHCP Discover· Client broadcast asking for IP address and PXE-capable DHCP service· DHCP discover package contains option 60· DHCP discover uses port 67 UDP

DHCP Offer· Reply of the DHCP server containing IP address offering on port 68 UDP· Reply of the DHCP or PXE server containing option 60

DHCP Request· Client broadcast, ready to acknowledge IP address and boot server (port 67 UDP)

DHCP Ack· Server broadcast, acknowledge clients IP address and lease (port 68 UDP)

DHCP Request· Client unicast request for options 66 (boot server) and option 67 (bootstrap file) (port 4011 UDP)· Unicast addresses server which offered option 60

DHCP Ack· Server ack from PXE server including options 66 and 67

Start of the bootstrap file download using TFTP (UDP 69 and UDP high level ports)

http://blogs.technet.com/b/dominikheinz/archive/2011/03/18/dhcp-amp-pxe-basics.aspx

QUESTION 10Which item in the Provisioning Services Console will the administrator need to configure to add a machineaccount from the Active Directory domain?

A. FarmB. vDiskC. ServerD. Target Device



Managing Domain PasswordsWhen target devices access their own vDisk in Private Image mode, there are no specialrequirements for managing domain passwords. However, when a target device accessesa vDisk in Standard Image mode, the Provisioning Server assigns the target device itsname. If the target device is a domain member, the name and password assigned byProvisioning Server must match the information in the corresponding computer accountwithin the domain. Otherwise, the target device is not able to log on successfully. Forthis reason, the Provisioning Server must manage the domain passwords for targetdevices that share a vDisk.

To enable domain password management you must disable the Active Directory-(or NT4.0 Domain) controlled automatic re-negotiation of machine passwords. This is done byenabling the Disable machine account password changes security p olicy at either thedomain or target-device level. Provisioning Server provides equivalent functionalitythrough its own Automatic Password Renegotiate feature.


QUESTION 11Which item in the Provisioning Services Console will the administrator need to configure to deletea machine account from the Active Directory domain?

A. FarmB. vDiskC. ServerD. Target Device



QUESTION 12An administrator notices that the target device is NOT starting from a newly created vDisk, but other targetdevices using different vDisks are working.

Which action can the administrator take to correct this issue?

A. Restart the Stream Service.B. Enable streaming on the vDisk.C. Reset the Active Directory machine account password.D. Change the vDisk access mode to Private Image mode.



vDisk PropertiesIn the Console, the vDisk Properties dialogs allows you to modify vDisk configurationsettings.

General TabEnable streaming of this vDisk

Enables this vDisk to be streamed to target devices.

QUESTION 13An administrator needs to configure a Provisioning services environment for Microsoft volume licensemanagement.

Which properties could the administrator configure to accomplish this task?

A. FarmB. vDiskC. ServerD. Target device



Configuring for Microsoft Volume LicensingProvisioning Services supports Microsoft Key Management Service (KMS) or MultipleActivation Key (MAK) volume licensing.

Note: When preparing or updating a KMS configured vDisk that will be copied orcloned, it is important to complete the final KMS configuration task, which is to changethe vDisk mode from Private Image Mode to Shared Image Mode, before copying orcloning the vDisk to other Provisioning Servers. Also, both the .pvp and .vhd file mustbe copied to retain the properties and KMS configuration of the original vDisk.

The tasks involved in configuring a vDisk image to use KMS volume licensing andmanaging that vDisk in a Provisioning Services farm include:

Enabling KMS licensing on the vDisk being created. This is accomplished by selectingthe KMS menu option on the Microsoft Volume Licensing tab when running theImaging Wizard


QUESTION 14Scenario: An administrator is delivering Windows virtual machines using Provisioning services. Theadministrator needs to reduce the impact on Provisioning services disk consumption as well as maintain useroperating system modifications.

Which cache mode must be used in this scenario?

A. Cache on ServerB. Cache in Device RAMC. Cache on Server PersistedD. Cache on Device Hard Drive Persisted



QUESTION 15Scenario: An administrator is in charge of distributing streamed Windows desktops to users using Provisioningservices. Users have reported that they CANNOT access any printers while using the streamed desktops. Theadministrator has confirmed local printers are installed in the base image.


A. Printer drivers are NOT configured.B. Network printers are NOT assigned to the users.C. Active Directory printers are assigned to the users.D. Printer Management is enabled in the vDisk properties.



Managing PrintersProvisioning Server provides a Printer Management feature that allows you to manage

which printers target devices have access to on a vDisk. Printers are managed from theTarget Device Properties dialog.

This feature should not be enabled if you use Active Directory to manage printers. Ifyou use an existing printer management tool, this feature should be disabled to avoidprinter setting conflicts.

Printers can only be added to the top-level differencing disk version while it is underMaintenance or if it is a Private Image. If a device boots from a previous version, theprinter configuration may not match.

There are two types of printers that can appear in the Console window:

Network PrintersLocal Printers

Before a target device can access a printer, the following tasks must be completed inthe order that follows:

Installing Printers on a vDiskPrinters must be installed on the vDisk image before the printers are available to targetdevices booting from that disk.

Enabling or Disabling Printers on a vDisk

Note: The Printer Management feature is only recommended if you are not usingActive Directory to manage printer groups.

By default, printers are not enabled on the vDisk. Enable or disable printers from theTarget Device Properties vDisk tab. On the Printers dialog, enable the checkbox next toeach printer to enable or disable it. After enabling (assigning) printers to targetdevices, the Printer Management feature must then be enabled on the vDisk.

Until Printer Management is enabled, all printers t hat are installed on the target deviceare available to that target device . By enabling Printer Management, you can selectprinters or remove printers from individual target devices.

QUESTION 16Scenario: An administrator is adding a new host to a XenServer resource pool. XenServer is already installedon the host, but the NTP server settings are configured incorrectly on the host.

Which file can the administrator edit to adjust the NTP server settings on the new XenServer host?

A. /etc/ntp.confB. /etc/ntp/keysC. /etc/init.d/ntpdD. /etc/ntp/step-tickers



QUESTION 17

A XenServer administrator is updating a shared disk image used by multiple virtual machines.What must the administrator do before updating the shared disk image?

A. Copy CIM.EXE to the vDisk.B. Modify the vDisk cache type.C. Disable streaming of the vDisk.D. Change the vDisk access mode.



QUESTION 18Scenario: In an environment with high availability enabled, an administrator discovered that a host isunreachable in a XenServer pool. The administrator disabled high availability in order to make the hostreachable.

Which xe CLI command can the administrator run to make the host reachable again?

A. host-disableB. host-evacuateC. pool-designate-new-masterD. pool-emergency-reset-master



QUESTION 19An administrator needs to run commands to specify __________ to configure email alerts at the host level.(Choose the correct option to complete the sentence.)

A. alarm_priority on the hostB. alarm_priority on the virtual machineC. the sender email address and SMTP serverD. the recipient email address and SMTP server


Explanation/Reference:9.1.2. Configuring Email Alerts

Note:Email alerts are only available in a pool with XenServer Advanced edition or above. To findout about XenServer editions and how to upgrade, visit the Citrix website.

Alerts generated from XenServer can also be automatically e-mailed to the resource pool administrator, inaddition to being visible from the XenCenter GUI. To configure this, specify the email address and SMTPserver :

pool:other-config:mail-destination =<[email protected]>pool:other-config:ssmtp-mailhub=<smtp.domain.tld[:port]>125

You can also specify the minimum value of the priority field in the message before the email will be sent:

pool:other-config:mail-min-priority=<level>

The default priority level is 5.

Note:Some SMTP servers only forward mails with addresses that use FQDNs. If you find that emailsare not being forwarded it may be for this reason, in which case you can set the serverhostname to the FQDN so this is used when connecting to your mail server.

QUESTION 20An administrator needs to authenticate all users when they log into the XenServer pool using their Windowscredentials.

What is the first step the administrator must take to achieve this?

A. Join the XenServer pool to the domain.B. Add each user to the Users tab in XenCenter.C. Create a XenServer user group within Active Directory.D. Create Active Directory accounts for the XenServer users.



2.2. Role Based Access ControlNote:The full RBAC feature is only available in Citrix XenServer Enterprise Edition or higher.

XenServer's Role Based Access Control (RBAC) allows you to assign users, roles, and permissions to controlwhohas access to your XenServer and what actions they can perform. The XenServer RBAC system maps a user(or a group of users) to defined roles (a named set of permissions), which in turn have associated XenServerpermissions (the ability to perform certain operations).

As users are not assigned permissions directly, but acquire them through their assigned role, management ofindividual user permissions becomes a matter of simply assigning the user to the appropriate role; thissimplifiescommon operations. XenServer maintains a list of authorized users and their roles.RBAC allows you to easily restrict which operations different groups of users can perform- thus reducing theprobability of an accident by an inexperienced user.

To facilitate compliance and auditing, RBAC also provides an Audit Log feature and its corresponding WorkloadBalancing Pool Audit Trail report.

RBAC depends on Active Directory for authentication services . Specifically, XenServer keeps a list ofauthorizedusers based on Active Directory user and group accounts. As a result, you must join the pool to the domainandadd Active Directory accounts before you can assign roles.

Exam F

QUESTION 1Scenario: A XenServer pool consists of two XenServer hosts. Both hosts have three network interface cards(NICs). One NIC will be used to connect to a new shared storage LUN. The administrator needs to be able tomigrate virtual machines from one XenServer host to the other.

What does the administrator need to select in XenCenter to make this LUN available to both XenServers?

A. CIFSB. NFS ISOC. Hardware HBAD. Software iSCSI



QUESTION 2Scenario: A XenServer host has a Fibre Channel adapter which is connected to the corporate SAN. The SANAdministrator created a new LUN and presented it to the XenServer host.

Which storage repository type does the administrator need to use to be able to create virtual machines on theLUN?

A. Local LVMB. EXT3 VHDC. Hardware HBAD. Software iSCSI



QUESTION 3Scenario: An administrator notices a duplex mismatch on the network interface card (NIC) which is configuredas the management interface.

The administrator realizes that the switch was set to 100 full, but XenServer auto-configured the NIC to 100half, autoneg=on.

How can the administrator ensure the XenServer host does NOT auto-configure the NIC in the future?

A. Change the NIC properties in the xsconsole.B. Use the xe pif-configure-ip command to disable auto-configuration.C. Use the xe pif-param-set command to set other-config:ethtool-autoneg=off.D. Assign a new NIC to the management interface within the XenCenter Network tab.

Correct Answer: CSection: (none)

Explanation


QUESTION 4Scenario: The SAN Administrator provided an NFS share for the XenServer Administrator to use. The sharename is NfsLun01 and is located at 192.168.0.53.

Which format must the administrator use to connect to the share?

A. 192.168.0.53:/NfsLun01B. \192.168.0.53\NfsLun01C. 192.168.0.53:3260\NfsLun01D. http://192.168.0.53/NfsLun01



QUESTION 5Scenario: An administrator of a XenServer resource pool is running multiple XenDesktop virtual machines. Toreduce the amount of network traffic between the host and network storage, the administrator enabledIntelliCache.

Which type of storage repository must the administrator use in this scenario?

A. HBAB. LVMC. EXT3D. iSCSI



QUESTION 6Scenario: An administrator is deploying a XenDesktop environment and would like to make use of XenServerIntelliCache on an existing host to improve performance. The environment is configured with local, iSCSI, andNFS ISO storage repositories (SRs). NO virtual machines are on the host.

What must the administrator do before IntelliCache can be enabled?

A. Create a new LUN on the iSCSI SR and enable thin provisioning.B. Convert the existing NFS ISO SR to NFS VHD with thin provisioning enabled.C. Destroy the existing LVM local SR and replace it with a thin provisioned EXT3 SR.D. Format the existing iSCSI SR with the EXT2 file system and enable thin provisioning.

Correct Answer: CSection: (none)

Explanation


Citrix XenServer ® 6.1.0 Installation Guide

Using XenServer with IntelliCache makes hosted Virtual Desktop Infrastructure deployments more cost-effectiveby enabling you to use a combination of shared storage and local storage. It is of particular benefit when manyVirtual Machines (VMs) all share a common OS image. The load on the storage array is reduced andperformanceis enhanced. In addition, network traffic to and from shared storage is reduced as the local storage caches themaster image from shared storage.

IntelliCache works by caching data from a VMs parent VDI in local storage on the VM host. This local cache isthenpopulated as data is read from the parent VDI. When many VMs share a common parent VDI (for example byallbeing based on a particular master image), the data pulled into the cache by a read from one VM can be usedbyanother VM. This means that further access to the master image on shared storage is not required.

A thin provisioned, local SR is an IntelliCache prerequisite. Thin Provisioning is a way of optimizing theutilizationof available storage. This approach allows you to make more use of local storage instead of shared storage. Itrelieson on-demand allocation of blocks of data instead of the traditional method of pre-allocating all of the blocks.

IntelliCache must be enabled either during host installation or be enabled manually on a running host using theCLI.

5.1.1. Enabling on Host InstallationTo enable IntelliCache during host installation, on the Virtual Machine Storage screen, select Enable thinprovisioning (Optimized storage for XenDesktop) . This selects the host's local SR to be the one to be usedforthe local caching of VM VDIs.

5.1.2. Converting an Existing Host to Use Thin Prov isioningTo destroy an existing LVM based local SR, and replace it with a thin provisioned EXT3 based SR, enter thefollowingcommands.Warning:These commands will destroy your existing local SR, and VMs on the SR will be permanentlydeleted.

.....

QUESTION 7Scenario: An administrator installed a new storage repository for use by a XenServer pool. The administratorneeds to enable multipathing to connect to the new storage device.

What does the administrator need to enable to meet the requirements of the scenario?

A. High availability

B. Maintenance modeC. Workload balancingD. Virtual machine protection policy



QUESTION 8Scenario: An administrator needs to ensure that all virtual machine traffic transmits over a specified VLAN. TheXenServer host has two network interface cards, one for management and the other for virtual machine traffic.

Which network type must the administrator create on a XenServer host to allow access to the specified VLAN?

A. BondedB. ExternalC. Cross-server privateD. Single-server private



4.3. XenServer Networking Overview

This section describes the general concepts of networking in the XenServer environment.

During XenServer installation, one network is created for each physical network interface card (NIC). When youadd a server to a resource pool, these default networks are merged so that all physical NICs with the samedevicename are attached to the same network.

Typically, you would only add a new network if you wanted to create an internal network, set up a new VLANusing an existing NIC, or create a NIC bond.

You can configure four different types of networks in XenServer:

• External networks have an association with a physical network interface and provide a bridge between avirtualmachine and the physical network interface connected to the network, enabling a virtual machine toconnectto resources available through the server's physica l network interface card .

• Bonded networks create a bond between two NICs to create a single, high-performing channel betweenthevirtual machine and the network.

• Single-Server Private networks have no association to a physical network interface and can be used toprovideconnectivity between the virtual machines on a given host, with no connection to the outside world.

• Cross-Server Private networks extend the single server private network concept to allow VMs on differenthosts to communicate with each other by using the vSwitch.

4.3.3.2. Using VLANs with Virtual Machines

Switch ports configured as 802.1Q VLAN trunk ports can be used in combination with the XenServer VLANfeaturesto connect guest virtual network interfaces (VIFs) to specific VLANs. In this case, the XenServer host performstheVLAN tagging/untagging functions for the guest, which is unaware of any VLAN configuration.

XenServer VLANs are represented by additional PIF objects representing VLAN interfaces corresponding to aspecified VLAN tag. XenServer networks can then be connected to the PIF representing the physical NIC toseeall traffic on the NIC, or to a PIF representing a VLAN to see only the traffic with the specified VLAN tag.

QUESTION 9Scenario: An administrator has three servers in a pool each containing three physical network interface cards(NICs). Currently NIC 0 is used for management, NIC 1 for virtual machine traffic, and NIC 2 for storage traffic.

Which network type must the administrator create to access multiple VLANs for virtual machine traffic?




QUESTION 10Scenario: An administrator needs to isolate network communication between two virtual machines on differentXenServer hosts in the same pool. The existing network features 1 GB switches, which do NOT supportVLANS.

Which network type must the administrator select to meet the requirements of the scenario?




4.3. XenServer Networking Overview

You can configure four different types of networks in XenServer:

• External networks have an association with a physical network interface and provide a bridge between avirtualmachine and the physical network interface connected to the network, enabling a virtual machine to connectto resources available through the server's physical network interface card.

• Bonded networks create a bond between two NICs to create a single, high-performing channel between thevirtual machine and the network.

• Single-Server Private networks have no association to a physical network interface and can be used toprovideconnectivity between the virtual machines on a given host, with no connection to the outside world.

• Cross-Server Private networks extend the single server private network concept to allow VMs ondifferenthosts to communicate with each other by using the vSwitch.


QUESTION 11Scenario: An administrator needs to configure a private network between virtual machines on two hosts in apool using XenCenter. However, the option to select the appropriate network type is NOT available.

Which XenServer component must the administrator use to enable the correct network type?

A. NIC bondB. DVS controllerC. XenServer ToolsD. DWLB appliance



QUESTION 12Scenario: An administrator needs to add two new XenServer hosts to an existing pool. Before adding a host tothe pool, the administrator created a network bond on the pool master.

Which CLI command must the administrator run to replicate the bond on the new hosts?

A. xe pool-joinB. xe bond-createC. xe network-createD. xe pool-param-set



4.4.3. Creating Networks in Resource PoolsAll XenServer hosts in a resource pool should have the same number of physical network interface cards

(NICs),although this requirement is not strictly enforced when a XenServer host is joined to a pool.

Having the same physical networking configuration for XenServer hosts within a pool is important because allhosts in a pool share a common set of XenServer networks. PIFs on the individual hosts are connected topoolwidenetworks based on device name. For example, all XenServer hosts in a pool with an eth0 NIC will have acorresponding PIF plugged into the pool-wide Network 0 network. The same will be true for hosts with eth1NICs and Network 1, as well as other NICs present in at least one XenServer host in the pool.

4.4.6.1. Adding NIC Bonds to New Resource Pools

1. Select the host you want to be the master. The master host belongs to an unnamed pool by default. Tocreatea resource pool with the CLI, rename the existing nameless pool:

xe pool-param-set name-label=<"New Pool" > uuid=<pool_uuid >

2. Create the NIC bond as described in Section 4.4.5.1, “Creating a NIC Bond”.

3. Open a console on a host that you want to join to t he pool and run the command:

xe pool-join master-address=<host1 > master-username=root master-password=<password >

The network and bond information is automatically r eplicated to the new host .


QUESTION 13Scenario: An administrator is installing Provisioning services on a new server. DHCP and PXE servers arealready configured.

Which option must the administrator select during the initial Provisioning services configuration to configure thePXE Service?

A. Microsoft DHCPB. Other BOOTP or DHCP ServiceC. Provisioning services BOOTP ServiceD. The service that runs on another computer



QUESTION 14Scenario: To improve performance and increase security, a network team will be moving all XenServer hostsinto a more secure, and high resiliency subnet. The administrator must now change the subnet mask on allXenServer hosts to match the new network: 172.16.0.0/16.

Which command will the administrator need to execute on each host?

A. xe pif-reconfigure-ip uuid= mode=dhcp netmask=255.255.0.0B. xe pif-reconfigure-ip uuid= mode=static netmask=255.255.0.0

C. xe pif-reconfigure-ip uuid= mode=dhcp netmask=172.16.0.0/16D. xe pif-reconfigure-ip uuid= mode=static netmask=172.16.0.0/16



QUESTION 15Scenario: An administrator has added a new provisioning server to an existing farm. The store is on a separatefile server.

What does the administrator need to configure to have existing virtual machines use the Stream Service fromthe new provisioning server?

A. vDisk storeB. TFTP ServiceC. DHCP optionsD. Bootstrap options



QUESTION 16What must be true in order to integrate Active Directory authentication with a XenServer host?

A. LDAP port 389 is open for inbound traffic to the XenServer host.B. The Active Directory administrator account is created locally on the XenServer host.C. The same DNS server is used for both the Active Directory server and the XenServer host.D. RAS authentication is used for communication between the Active Directory server and the XenServer host.



QUESTION 17Scenario: An administrator configured XenServer Role Based Access Control (RBAC) toauthenticate using Active Directory. Using RBAC, the administrator must grant Level 2 Support users withpermission to start and stop virtual machines.

Which two steps must the administrator take to grant Level 2 Support users virtual machine permissions?(Choose two.)

A. Assign a role to the subject.B. Add an Active Directory group to the pool.C. Assign XenServer permissions to a group.D. Add users and their roles to the authorized list of users.



2.2. Role Based Access Control

RBAC process

This is the standard process for implementing RBAC and assigning a user or group a role:

1. Join the domain. See Enabling external authentication on a pool 2. Add an Active Directory user or group to the pool. This becomes a subject. See Section 2.2.3.3, “To

Add a Subject to RBAC”.3. Assign (or modify) the subject's RBAC role. See Section 2.2.3.4, “To Assign an RBAC Role to a Created

subject ”.

QUESTION 18An administrator was given new security rules and now needs to remove specific permissions from the users inthe VM Admin Role Based Access Control group.

How can the administrator remove the specific permissions from the VM Admin user group?

A. Reset the VM Admin user group back to the default permissions.B. Delete the registry key that applies to the specific permissions that need to be removed.C. Run the xe subject-role-remove uuid=<subject UUID> role-name=vm.pool_migrate XenServer command.D. Remove the specific permissions from the Active Directory user group associated with the VM Admin user

group.



2.2.3.5. To Change a Subject's RBAC Role:

To change a user's role it is necessary to remove them from their existing role, and add them to a new role:

1. Run the commands:xe subject-role-remove uuid=<subject uuid> role-name=<role_name_to_remove>xe subject-role-add uuid=<subject uuid > role-name=<role_name_to_add >

To ensure that the new role takes effect, the user should be logged out and logged back in again (this requiresthe "Logout Active User Connections" permission - available to a Pool Administrator or Pool Operator).

Warning:Once you have added or removed a pool-admin subject, there can be a delay of a few secondsfor ssh sessions associated to this subject to be accepted by all hosts of the pool.

QUESTION 19Scenario: An administrator is planning to introduce 100 new virtual machines into the environment. Theadministrator plans to use XenServer templates and duplication mechanisms.

What must the administrator consider when deciding between the full copy and fast clone duplicationmechanisms?

A. A template needs to be copied before it can be fast cloned.B. A virtual machine that is duplicated using the full copy method may impact disk performance.C. A virtual machine that is duplicated using the fast cloned method may impact disk performance.D. A template created on local storage can be duplicated by using the full copy method by any host in the pool.



2.2.2. Cloning an Existing VM

XenServer has two mechanisms for cloning VMs:

1. A full copy2. Copy-on-Write (CoW)

The faster Copy-on-Write (CoW) mode only writes modified blocks to disk and is only supported forfilebackedVMs. CoW is designed to save disk space and allow fast clones, but will slightly slow down normal diskperformance . A template can be fast-cloned multiple times without slowdown.

Note:

If a template is cloned into a VM and the clone converted back into a template, diskperformance can linearly decrease depending on the number of times this has happened. Inthis event, the vm-copy CLI command can be used to perform a full copy of the disks andrestore expected levels of disk performance.


QUESTION 20An administrator cloned a template into a virtual machine and then converted it back into a template.

Which action must be performed on the disks to restore expected levels of disk performance?

A. Run SysPrepB. Complete a full copyC. Execute a fast cloneD. Suspend before cloning



Citrix XenServer ® 6.1.0 Administrator's Guide

5.1.6.4. VHD-based VDIs

When cloning VMs based on a single VHD template, each child VM forms a chain where new changes arewrittento the new VM, and old blocks are directly read from the parent template. If the new VM was converted into afurther template and more VMs cloned, then the resulting chain will result in degraded performance. XenServersupports a maximum chain length of 30, but it is generally not recommended that you approach this limitwithoutgood reason. If in doubt, "copy" the VM using XenCenter or use the vm-copy command, which resets the chainlength back to 0.

A.4.27.11. vm-copyvm-copy new-name-label=<name_for_copy> [new-name-description=<description_for_copy>][sr-uuid=<uuid_of_sr>] [<vm-selector>=<vm_selector_value>...]

Copy an existing VM, but without using storage-level fast disk clone operation (even if this is available). Thediskimages of the copied VM are guaranteed to be "full images", that is, not part of a copy-on-write (CoW)chain.

Specify the name and the optional description for the resulting copied VM using the new-name-label andnew-name-description arguments.

Specify the destination SR for the resulting copied VM using the sr-uuid. If this parameter is not specified, thedestination is the same SR that the original VM is in.




1Y0-A26 - Citrix XenServer 6.0 Administration - GRATIS EXAM · -p port-s server Example: On a ......

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