Data Communication and Networking MCQs

16.

The cable connecting a DB-9 connector at one end to a DB-25 connector at the other end must cross-connect pin 8 at the BD-9 side to which pin at the DB-25 side.

   A.) 2
   B.) 5
   C.) 7
   D.) 23

Answer: Option 'B'

5

17.

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)

18.

Layer one of the OSI model is _______.

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

Answer: Option 'A'

physical layer

19.

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

20.

Satellite transponders.

   A.) use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.
   B.) use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations.
   C.) use a single frequency for reception and transmission from one point on earth to another
   D.) are devices that echo the radiation without change from one point on earth to another

Answer: Option 'A'

use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.

21.

A packet-switching network

   A.) is free
   B.) can reduce the cost of using an information utility
   C.) allows communication channels to be shared among more than one user
   D.) both (B) and (C)

Answer: Option 'D'

both (B) and (C)

22.

Local area network can transmit _________.

   A.) faster than telecommunications over public telephone lines.
   B.) slower than telecommunications over public telephone lines.
   C.) using twisted-pair wiring or coaxial cables
   D.) both (A) and (C)

Answer: Option 'D'

both (A) and (C)

23.

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

24.

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

25.

The path or channels over which information moves from one location to another make-up is called.

   A.) lines
   B.) remote computers
   C.) modems
   D.) file transfer

Answer: Option 'A'

lines

26.

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

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

Answer: Option 'B'

​entropy

27.

The coupling efficiency of an Led light source to an optical fiber with a numerical aperture of 0.2 or more is ________. 

   A.) 60 per cent
   B.) 10 per cent
   C.) 2 per cent
   D.) 0.1 per cent

Answer: Option 'C'

​2 per cent

28.

Which of the following is used for modulation and demodulation?

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

Answer: Option 'A'

Modem

29.

Telephone broadcast is an example of _______ transmission.

   A.) Simplex
   B.) Half duplex
   C.) Full duplex
   D.) Automatic

Answer: Option 'B'

​Half duplex

30.

While transmitting odd-parity coded symbols, the number of zeros in each symbol is….

   A.) odd
   B.) even
   C.) unknown
   D.) None of these

Answer: Option 'C'

unknown

Data Communication and Networking MCQs Download Pdf

Recent Posts