-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (1) If there is an IP phone capable of sending SIP messages, what will it be called SIP Registrar 2Marks SIP Redirect Server SIP User Agent SIP Proxy Server Sip UA-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (2) Which of the following is a problem only in Packet Switched networks and not in circuit switched networks? Latency 2Marks Jitter None of the given options is correct Voice quality degradation due to digital to analog conversion Jitter-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (3) Which of the following is true for MGCP None of the options 3Marks It supports binary encoding of its messages It is used for communication between the Media Gateway and Media Gateway Controller It is a master-slave protocol It is used for communication between the Media Gateway and Media Gateway Controller It is a master-slave protocol -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (4) Intelligent Peripheral (IP) manages specific resources, such as SSP 2Marks STP SCP Announcements, Speech recognition, Protocol conversions -------------------------------------------------------------------------------- Announcements, Speech recognition, Protocol conversions-------------------------------------------------------------------------------- (5) In GSM which element hold the Secret Keys SIM 2Marks HLR AUC and SIM AUC Auc and sim-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (6) Having two separate units of MS, ME and SIM, provides Terminal mobility 2Marks CLI facility Roaming Facility SIM Mobility Terminal Mobility-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (7) Which of the following are some of the benefits of using a signaling gateway When using signaling gateways there is no need to disrupt the existing SS7 network and future enhancement transparent 2Marks All of the given options No need for further expensive investments in the legacy signaling elements Signaling transport over IP network doesn't demand the physical E1/T1 links. Using new technologies like IP over fiber, for example, can achieve much higher throughput all the options-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (8) One of the statements about BCSM is incorrect Has two parts - originating call model and terminating call model 2Marks All triggers in any call in an SSP are dynamically set by the SCP Represents an abstract view of a call from beginning to end (off hook; dialling; answer; no answer; busy; hang up etc). As each state is traversed, the exchange encounters Detection Points (DPs) at which the SSP may invoke a query to the SCP to wait for further instructions on how to proceed. -------------------------------------------------------------------------------- All triggers in any call in an SSP are dynamically set by the SCP -------------------------------------------------------------------------------- (9) Which one is not a SNMP primitive? Trap 2Marks M-get Set request Get request m-get-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (10) Which of the following network is used to connect end users? Access Network 2Marks None of the given options Distribution Network Core Network Access Network-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (11) To say that a network is intelligent means that it is _______ controlled by microships that are easily intechanged 2Marks able to make decisions on its own able to bridge the gap between user and supplier needs controlled by software on distributed computers -------------------------------------------------------------------------------- able to make decisions on its own -------------------------------------------------------------------------------- (12) All signaling associated with call setup and tear down, database query and response, and SS7 network management takes place using MSUs 2Marks None of the given options FISUs LSSUs msu-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (13) Which logical function in SIP handles routing of messages User Agents 2Marks Redirect Servers Proxy servers Registrars Proxy servers -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (14) GSM utiize TDMA only 2Marks FDMA only CDMA only FDMA and TDMA Both -------------------------------------------------------------------------------- FDMA and TDMA Both -------------------------------------------------------------------------------- (15) Function(s) of Manager is(are) Receive response from agents 2Marks Send directives to agents All of the options are correct Query agents -------------------------------------------------------------------------------- All of the options are correct -------------------------------------------------------------------------------- (16) Which layer 4 protocol is used by VOIP for voice or bearer transmission WTCP because it works better for wireless channels 2Marks SCTP because it supports multistreaming TCP because it provides reliable transport UDP because TCP is not suited for real time applications -------------------------------------------------------------------------------- UDP because TCP is not suited for real time applications -------------------------------------------------------------------------------- (17) The primary function of RTCP is to provide feedback on the quality of service being provided by RTP True 1Marks False Not Answer true-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (18) A service control point (SCP) is ________________ an instance in time at which the network selects a serice to initiate 2Marks a database for various IN services a series of triggers that initiate controller actions a switch that is controlled by the intelligent network -------------------------------------------------------------------------------- a database for various IN services-------------------------------------------------------------------------------- (19) Indian telecom network is divided into a number of TAX (Trunk Automatic Exchange) 2Marks LDCAs SDCAs exchanges TAX-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (20) Core Network provides following functionality Mobility Management 3Marks All of the given options Radio Resource Management Call Handling Mobility-------------------------------------------------------------------------------- Call Handling -------------------------------------------------------------------------------- (21) Consider the following problem:Alice has the following public URI Alice.Smith@domain.com regardless of her current location. At office, her SIP URI is sip:asmith@ws1234.company.com and at the university her URI is sip:alice@pc12.university.edu. Whether she is in the office or university , I can still initiate a session towards her with the Id Alice.Smith@domain.com. Which of the following network element in SIP makes this possible? SIP User Agent Client 2Marks SIP Registrar SIP Redirect Server SIP User Agent Server SIP Registrar -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (22) Which SIP message is used to initiate a session Initiate 2Marks Invite Initial Address Message Create Connection Invite -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (23) Trunk interface signaling is from subscriber to network 2Marks none of the given options subscriber to subscriber within network within network -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (24) Normally, each LDCA has a Long Distance Charging Centre (LDCC), which is a Transit switch 2Marks none of the options Integrated Local cum tandem exchange TAX (Trunk Automatic Exchange) -------------------------------------------------------------------------------- Integrated Local cum tandem exchange -------------------------------------------------------------------------------- (25) Which of the following technologies use common channel signaling scheme None of the options 2Marks SS7 IP DTMF ss7-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (26) Multiplexing is used to _______ None of the options 2Marks Shift frequency spectrum of the baseband signal Distribute communication resources among users Separate information for various users from a single frame -------------------------------------------------------------------------------- Distribute communication resources among users -------------------------------------------------------------------------------- (27) The development of the intelligent network places increased emphasis on a consistent ____________ call model 2Marks intelligence model switch model network model ???????????????-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (28) Which one is not type of NM system Distributed 2Marks Centralised Hierarchy Layered Layered -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (29) Subscriber is in idle mode and he moves from one cell to another cell which belongs to another PLMN this is termed as Roaming 2Marks Inter Cell HandOver Inter BSC HandOver Inter MSC HandOver Roaming -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (30) Idle, seizure, answer, metering are examples of Register signals 2Marks Line signals none of the given options is correct tones and announcements Line signals -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (31) The first generation Cellular systems were digital 2Marks analog none of the given options is correct Mix of analog and digital analog -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (32) Which of the following present the challenges faced by voice on packet switched networks Packets may arrive out of sequence 3Marks None of the options is correct Bandwidth is wasted as it cannot be used for any other purpose Congestion can occur at every packet as there is no dedicated route Packets may arrive out of sequence-------------------------------------------------------------------------------- Congestion can occur at every packet as there is no dedicated route -------------------------------------------------------------------------------- (33) The SCCP supports No load sharing among SCPs 3Marks none of the given options Global title translation routing to subsystems Global title translation routing to subsystems -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (34) Network Management functionality in MTP3 consists of Signaling Route Management 3Marks No Signaling Link Management none of the given options Signaling Traffic Management Signaling Route ManagementSignaling Traffic Management ---------------------------------------------------------------------------- -------------------------------------------------------------------------------- (35) FCAPS stands for Failure, Configuration, Acounting, Performance and Safety management 2Marks Failure, Configuration, Acounting, Performance and Security management Fault, Configuration, Authentication, Performance and Security management Fault, Configuration, Acounting, Performance and Security management Fault, Configuration, Acounting, Performance and Security management -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (36) Basic service area unit in Cellular mobile Networks is known as All of the given options 2Marks Cell Routing Area Location Area Cell-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (37) MTP2 provides reliable transfer of signaling messages between two directly connected signaling points over the signaling link in uniform length signaling units 2Marks none of the given options a sequenced connectionless service to transfer information from origination point code to the destination point code via SS7 network reliable transfer of signaling messages between two directly connected signaling points over the signaling link in variable length signaling units reliable transfer of signaling messages between two directly connected signaling points over the signaling link in uniform length signaling units 2Marks -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (38) VLR/HLR tracks the location of MS upto a MSC Area 2Marks Location Area BSC Area Cell -------------------------------------------------------------------------------- BSC Area -------------------------------------------------------------------------------- (39) Which of the following statements are true? Datagram networks ensure reliable delivery 2Marks Virtual Circuit networks ensure reliable data delivery None of the given options Packet-Switched networks ensure reliable data delivery Virtual Circuit networks ensure reliable data delivery -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (40) In European Digital Carrier, E1= 24 x DS0 plus framing 2Marks 30 x DS0 plus framing 62 x DS0 + 2 x 64kbps for signaling 30 x DS0 + 2 x 64kbps for signaling 30 x DS0 + 2 x 64kbps for signaling -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (41) EIR HOLD TMSI 2Marks All of the given options IMSI IMEI IMEI -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (42) A central office switch that connects end offices together and does not deal directly with the customer/end-user is called end office switch 2Marks access switch none of the options tandem switch tandem switch -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (43) VOIP makes use of which of the following methods to transmit voice Packet Switched 2Marks None of the given options Virtual Circuit Switched Circuit Switched Packet Switched -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (44) Which of the options are true for Circuit Switching Technology It can support variable data rate 3Marks It can support only fixed data rate For every call, Addressing Information passes through the network more than once Connection Establishment takes place prior to any data transfer Connection Establishment takes place prior to any data transfer It can support only fixed data rate -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (45) Suppose signal power received at your mobile antenna is 10 mW and the SNR is 10 dBm, what is the noise power? 10 mW 2Marks 1 pW 1 W 1 mW 1MW-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (46) Two channels will be available to MS for a small duration in Soft Handover 2Marks Hard handover Intra Cell Handover Inter Cell Handover Intra Cell Handover-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (47) MIB is a database at Managed entity 2Marks Manager All of the options are correct Client Managed entity-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (48) If a signal is band-limited to 8 kHz by anti-aliasing filter, what would be minimum sampling rate for such a signal 16 kHz 2Marks 32 kHz 4 kHz 8KHz 16 khz-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (49) To make BER very low, SNR should be As low as possible 2Marks As high as possible Depends on the communication system under consideration Zero ?? should me high-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- (50) Modulated signal is also known as Carrier Signal 2Marks Message Signal Pass-band signal Baseband Signal