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Chapter 7: Basic Wireless
Concepts and Configuration
CCNA Ex loration 4.0
1
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Objectives
Describe the components and operations of basicwireless LAN topologies.
Describe the components and operations of basicwireless LAN security.
Configure and verify basic wireless LAN access.
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Configure and troubleshoot wireless client access.
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The Wireless LAN
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Benefits of WLANs
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Wireless Technologies
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Wireless LAN
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Comparing a WLAN to a LAN
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In an 802.3 Ethernet LAN, each client hasa cable that connects the client NIC to aswitch. The switch is the point where theclient gains access to the network.
In a wireless LAN, each client uses awireless adapter to gain access to thenetwork through a wireless device such asa wireless router or access point.
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Wireless standards
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Wi-Fi Certification
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Wireless Infrastructure Components
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Extra: Wireless LAN Frame
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Wireless Access Points
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Carrier Sense Multiple Access with Collision Avoidance(CSMA/CA)
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Access points oversee a distributed coordination function (DCF) calledCarrier Sense Multiple Access with Collision Avoidance (CSMA/CA).
This simply means that devices on a WLAN must sense the medium for energy(RF stimulation above a certain threshold) and wait until the medium is free
before sending.
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RTS/CTS
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One means of resolving the hidden node problem is a CSMA/CAfeature called request to send/clear to send (RTS/CTS).
RTS/CTS was developed to allow a negotiation between a client andan access point.
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Extra: RTS/CTS
The optional request-to-send and clear-to-send (RTS/CTS) functionallows the access point to control use of the medium for stationsactivating RTS/CTS.
With most radio NICs, users can set a maximum frame-lengththreshold for when the radio NIC activates RTS/CTS. For example, a frame length of 1,000 bytes triggers RTS/CTS for all
frames larger than 1,000 bytes.
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,
access point before sending a data frame. The access point thenresponds with a CTS frame, indicating that the radio NIC can send thedata frame.
With the CTS frame, the access point provides a value in the durationfield of the frame header that holds off other stations from transmittinguntil after the radio NIC initiating the RTS can send its data frame. Thisavoids collisions between hidden nodes.
The RTS/CTS handshake continues for each frame, as long as theframe size exceeds the threshold set in the corresponding radio NIC.
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Extra: RTS/CTS
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Configurable Parameters for Wireless Endpoints
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Configurable Parameters for Wireless Endpoints
If there are three adjacent access points, use channels 1, 6, and 11. Ifthere are just two, select any two that are five channels apart, such aschannels 5 and 10.
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802.11 Topologies: Ad hoc Network
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802.11 Topologies: Infrastructure
Basic Service Sets
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802.11 Topologies: Infrastructure
Extended Service Sets
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Extra: Roaming
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Extra: Roaming
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Extra: Scanning
The 802.11 standard defines both passive and active scanning,whereby a radio NIC searches for access points.
Passive scanning is mandatory where each NIC scans individualchannels to find the best access-point signal. Periodically, accesspoints broadcast a beacon, and the radio NIC receives these beaconswhile scanning and takes note of the corresponding signal strengths.The beacons contain information about the access point, includingSSID and su orted data rates. The radio NIC can use this information
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along with the signal strength to compare access points and decide onwhich one to use.
Active scanning is similar, except the radio NIC initiates the processby broadcasting a probe frame, and all access points within rangerespond with a probe response. Active scanning enables a radio NIC to
receive immediate response from access points, without waiting for abeacon transmission. The issue, however, is that active scanningimposes additional overhead on the network because of thetransmission of probe and corresponding response frames.
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Client and Access Point Association
Beacon
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Client and Access Point Association
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Client and Access Point Association
Step 3 - 802.11 Association
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Extra: Open Authentication
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The Open Authentication method performs the entire authenticationprocess in clear text.
Open Authentication is basically a null authentication, which meansthere is no verification of the user or machine.
Open Authentication is usually tied to a WEP key. A client canassociate to the access point with an incorrect WEP key or even noWEP key. A client with the wrong WEP key will be unable to send orreceive data, since the packet payload will be encrypted.
Keep in mind that the header is not encrypted by WEP. Only thepayload or data is encrypted.
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Extra: Shared Key Authentication
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Shared Key Authentication works similarly to Open Authentication,except that it uses WEP encryption for one step.
Shared key requires the client and the access point to have the sameWEP key.
An access point using Shared Key Authentication sends a challengetext packet to the client. If the client has the wrong key or no key, it willfail this portion of the authentication process. The client will not beallowed to associate to the AP.
Shared key is vulnerable to a man-in-the-middle attack, so it is notrecommended.
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Extra: ARS
When a source node sends a frame, the receiving node returns a
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.
This can cause consumption of50%of the available bandwidth. This overhead when combined with the collision avoidance protocol
overhead reduces the actual data throughput to a maximum of 5.0 to5.5 Mbpson an 802.11b wireless LAN rated at 11 Mbps.
Performance of the network will also be affected by signal strength anddegradation in signal quality due to distance or interference.
As the signal becomes weaker, Adaptive Rate Selection (ARS) maybe invoked and the transmitting unit will drop the data rate from 11Mbps to 5.5 Mbps, from 5.5 Mbps to 2 Mbps or 2 Mbps to 1 Mbps.
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Planning the Wireless LAN
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Planning the Wireless LAN
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Planning the Wireless LAN
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Planning the Wireless LAN
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Activity 7.1.5.2
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Activity 7.1.5.2
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Wireless LAN Security
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Wireless LAN Security Threats
Unauthorized Access
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S
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Wireless LAN Security Threats
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Wi l LAN S i Th
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Wireless LAN Security Threats
Denial of Service
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E t S i WLAN
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Extra: Securing a WLAN
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E t SSID
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Extra: SSID
Most access points have options like SSID broadcast and allow any
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. ese eatures are usua y ena e y e au t an ma e t easy
to set up a wireless network. Using the allow any SSID option lets the access point allow
access to a client with a blank SSID. The SSID broadcast sends beacon packets, which advertise the
SSID.
Disabling these two options do not secure the network, since awireless sniffer can easily capture a valid SSID from normal WLANtraffic.
SSIDs should not be considered a security feature.
Wireless Security Protocols
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Wireless Security Protocols
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Extra: Wireless Security Protocols
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Extra: Wireless Security Protocols
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Extra: Encryption Methods
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Extra: Encryption Methods
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Wi-Fi Protected Access The Wi-Fi Protocol Access (WPA) standard provided by the Wi-Fi
Alliance provides an upgrade to WEP that offers dynamic keyencryption and mutual authentication.
Most wireless vendors now support WPA. WPA clients utilizedifferent encryption keys that change periodically. This makes itmore difficult to crack the encryption.
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Wireless Security Protocols
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Wireless Security Protocols
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Wireless Security Protocols
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Wireless Security Protocols
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Wireless Security Protocols
Encryption
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Securing a Wireless LAN
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Securing a Wireless LAN
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Configuring the Wireless Access Point
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Configuring the Wireless Access Point
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Setup: Basic Setup
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Setup: Basic Setup
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Administration: Management
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Administration: Management
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Configuring Basic Wireless Settings
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g g g
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Security Mode
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y
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Select the mode you want to use: PSK-Personal, PSK2-Personal, PSK-Enterprise, PSK2-Enterprise, RADIUS, orWEP.
Mode Parameters
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Enterprise modes are not configured in this chapter
Configure Encryption and Key
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g yp y
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Configure a wireless NIC: Scan SSID
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Configure a wireless NIC: Scan SSID
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Select the Wireless Security Protocol
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Practice: 7.3.2.4
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Troubleshooting
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Systematic Approach to WLAN Troubleshooting
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Step 1 - Eliminate the client device as the source of theproblem.
Step 2 - Confirm the physical status of WLAN devices. Step 3 - Inspect wired links.
Updating the Access Point Firmware
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Incorrect Channel Settings
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Incorrect Channel Settings: Solution
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Solving RF Interference
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Solving RF Interference
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Site Surveys
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Site Survey
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Two categories: Manual and utility assisted. Manual site surveys can include a site evaluation to be followed by a more thorough
utility-assisted site survey. A site evaluation involves inspecting the area with the goal of
identifying potential issues that could impact the network. Specifically, look for thepresence of multiple WLANs, unique building structures, such as open floors andatriums, and high client usage variances, such as those caused by differences in day ornight shift staffing levels.
Note: you do not conduct site surveys as part of this course
Access Point Misplacement
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Access Point Misplacement: Solution
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Access Point Misplacement: Solution
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Ensure that access points are not mounted closer than 7.9 inches (20cm) from the body of all persons.
Do not mount the access point within 3 feet (91.4 cm) of metalobstructions.
Install the access point away from microwave ovens. Microwave ovensoperate on the same frequency as the access point and can causesignal interference.
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Always mount the access point vertically (standing up or hangingdown).
Do not mount the access point outside of buildings. Do not mount the access point on building perimeter walls, unless
outside coverage is desired.
When mounting an access point in the corner of a right-angle hallwayintersection, mount it at a 45-degree angle to the two hallways. Theaccess point internal antennas are not omnidirectional and cover alarger area when mounted this way.
Problems with Authentication and Encrytion
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Problems with Authentication and Encrytion
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Problems with Authentication and Encrytion
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Summary
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