telecom set3

8/12/2019 Telecom Set3

1/22

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(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

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------


2/22

(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


3/22

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


4/22

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

--------------------------------------------------------------------------------


5/22

--------------------------------------------------------------------------------

(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


6/22


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


7/22

--------------------------------------------------------------------------------

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

--------------------------------------------------------------------------------


--------------------------------------------------------------------------------

(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

--------------------------------------------------------------------------------


8/22

(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


9/22

TAX

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(20) Core Network provides following functionality

Mobility Management 3Marks


Radio Resource Management

Call Handling

Mobility

--------------------------------------------------------------------------------

Call Handling

--------------------------------------------------------------------------------

(21) Consider the following problem:

Alice has the following public URI [email protected] regardless of her current location. At

office, her SIP URI is sip:[email protected] and at the university her URI is

sip:[email protected]. Whether she is in the office or university , I can still initiate a session

towards her with the Id [email protected]. 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


10/22

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

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------


11/22

(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


SS7

IP

DTMF

ss7

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(26) Multiplexing is used to _______


Shift frequency spectrum of the baseband signal

Distribute communication resources among users


12/22

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

call model

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(28) Which one is not type of NM system

Distributed 2Marks

Centralised

Hierarchy

Layered

Layered

--------------------------------------------------------------------------------


13/22

--------------------------------------------------------------------------------

(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


14/22

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


Global title translation


15/22

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


Signaling Traffic Management

Signaling Route Management

Signaling Traffic Management

----------------------------------------------------------------------------

--------------------------------------------------------------------------------

(35) FCAPS stands for

Failure, Configuration, Acounting, Performance and Safety management 2Marks

Failure, Configuration, Acounting, Performance and Security management


16/22

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


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


17/22

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


Packet-Switched networks ensure reliable data delivery

Virtual Circuit networks ensure reliable data delivery

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------


18/22

(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



--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(41) EIR HOLD

TMSI 2Marks


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


19/22

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


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


20/22

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


21/22

Intra Cell Handover

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

(47) MIB is a database at

Managed entity 2Marks

Manager


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

--------------------------------------------------------------------------------


22/22

--------------------------------------------------------------------------------

(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

telecom set3

Documents