Data Communication and Networking MCQs

1.

Communications software package enable users to  access services such as _______.

   A.) electronic mail
   B.) electronic bulletin boards
   C.) video channels
   D.) both (A) and (B)

Answer: Option 'D'

both (A) and (B)

2.

Information utilities.

   A.) are usually free
   B.) can be used to send electronic mail.
   C.) are run by companies that sell time on their time shared mainframe computers
   D.) Both (A) and (B)

Answer: Option 'D'

Both (A) and (B)

3.

An encyclopedic database is ________.

   A.) an information utility that specializes in storing and searching information
   B.) generally free
   C.) easy for beginners to use
   D.) all of these

Answer: Option 'A'

an information utility that specializes in storing and searching information

4.

HF ratio waves follow how many basic paths on leaving the transmitter?

   A.) Two
   B.) Four
   C.) One
   D.) Many

Answer: Option 'A'

Two

5.

What is used to identify whether a data word has an odd or even number of 1's? 

   A.) Cary bit 
   B.) Zero bit
   C.) Parity bit
   D.) Sign bit

Answer: Option 'C'

Parity bit

6.

The number of OC-1 signals within an SONET OC-3 signal is ______.

   A.) 3
   B.) 6
   C.) 9
   D.) 12

Answer: Option 'A'

3

7.

The amount of uncertainty in a system of the symbol is called.

   A.) bandwidth
   B.) entropy
   C.) loss
   D.) quantum

Answer: Option 'B'

​entropy

8.

Coaxial cable has conductors with _______.

   A.) a common axis
   B.) equal resistance
   C.) the same diameter
   D.) none of these

Answer: Option 'A'

​a common axis

9.

The CCITT V.26 modem has a modulation rate of ________.

   A.) 1200 Hz
   B.) 1200 bands
   C.) 1560 cps
   D.) None of these

Answer: Option 'B'

1200 bands

10.

Which section of a synchronous modem contains the scrambler?

   A.) Terminal section
   B.) Receiver section
   C.) Control section
   D.) Transmission section

Answer: Option 'D'

Transmission section

11.

Which of the following is used for modulation and demodulation?

   A.) Modem
   B.) Protocols
   C.) Gateway
   D.) Multiplexer

Answer: Option 'A'

Modem

12.

Users use often _______ for access to mainframe or supercomputer 

   A.) terminal 
   B.) node
   C.) desktop
   D.) hand held 

Answer: Option 'A'

terminal

13.

Extended command sets supported by modern modems.

   A.) are standardized.
   B.) are prefixed with the letter E.
   C.) use different commands to control many advanced modem features.
   D.) can be counted on to provide a high-speed data transfer capability without requiring flow control.

Answer: Option 'C'

use different commands to control many advanced modem features.

14.

A half-duplex communication channel permits information to travel ________.

   A.) both ways at once
   B.) both ways, but not at once
   C.) one direction only
   D.) at timed intervals

Answer: Option 'B'

both ways, but not at once

15.

Which layer os international standard organization OSI model is responsible for creating and recognizing frame boundaries?

   A.) physical layer
   B.) data link layer
   C.) transport layer
   D.) network layer

Answer: Option 'B'

data link layer

16.

LAN is useful for __________.

   A.) railway 
   B.) bank 
   C.) businessman 
   D.) transport 

Answer: Option 'C'

​businessman 

17.

A protocol is a rule governing a time sequence of events that must take place.

   A.) between peers
   B.) across an interface
   C.) between non-peers
   D.) none of these

Answer: Option 'A'

between peers

18.

The bandwidth required to send 132 voice-grade channels by FDM on an international satellite system is _______.

   A.) 500 MHz
   B.) 10 MHz
   C.) 1320 MHz
   D.) 50 MHz

Answer: Option 'B'

​10 MHz

19.

The core for an optical fiber has ________.

   A.) lower index of refraction than air
   B.) lower index of refraction than the cladding
   C.) a higher index of refraction than the cladding
   D.) none of these

Answer: Option 'C'

a higher index of refraction than the cladding

20.

The maximum modem operating rate that can be transported by ADPCM is ______.

   A.) 300 bps
   B.) 1200 bps
   C.) 4800 bps
   D.) 9600 bps

Answer: Option 'C'

4800 bps


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