Data Communication and Networking MCQs

1.

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)

2.

The synchronous modems are more expensive than the asynchronous modems because _______. 

   A.) they must contain clock recovery circuits
   B.) production volume is larger
   C.) they must operate on a larger bandwidth
   D.) They are larger

Answer: Option 'A'

they must contain clock recovery circuits

3.

An error detecting code is the remainder resulting from dividing the bits to be checked by a predetermined binary number, is called.

   A.) cyclic redundancy check
   B.) checksum
   C.) error detecting code
   D.) error rate

Answer: Option 'A'

​cyclic redundancy check

4.

Which data communication method is used to send data over a serial communication link?

   A.) simplex
   B.) half duplex
   C.) full duplex
   D.) all of these

Answer: Option 'C'

​full duplex

5.

Internet address can be used to refer to networks as well as individual hosts. By convention, the network address has hosted with all bits.

   A.) 0
   B.) 1
   C.) combinations of 0 and 1
   D.) none of these

Answer: Option 'A'

0

6.

Which of the following is not of the same group?

   A.) Internet 
   B.) Apple talk
   C.) Bus 
   D.) Ring

Answer: Option 'B'

​Apple talk

7.

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.

8.

Escape sequences

   A.) use ESC character to indicate the start of a special control sequence
   B.) are used to switch (escape) between ASCII and EBCDI codes
   C.) are a popular daydream for inmates
   D.) None of these

Answer: Option 'A'

​use ESC character to indicate the start of a special control sequence

9.

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

10.

The probability that a single bit will be in error on a typical public tele-phone line using 4800 bps modem is 10-3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to ______.

   A.) 0.003
   B.) 0.009
   C.) 0.991
   D.) 0.999

Answer: Option 'B'

0.009

11.

The most flexibility how devices are wired together is provided by ______.

   A.) bust networks
   B.) ring networks
   C.) star networks
   D.) T-switched networks

Answer: Option 'A'

bust networks

12.

A streaming protocol….

   A.) provides error detection
   B.) does not provide error detection
   C.) uses 64-byte blocks
   D.) requires a manual setup’

Answer: Option 'B'

does not provide error detection

13.

A network that requires human intervention to route signals is called.

   A.) bus network
   B.) ring network
   C.) star network
   D.) T-switched network

Answer: Option 'D'

T-switched network

14.

In a synchronous modem, the digital-to-analog converter sends a signal to the _______

   A.) transmission line
   B.) modulator
   C.) terminal
   D.) equalizer

Answer: Option 'D'

equalizer

15.

If a modem packs six bits into each signal change and operates at 14,400 bps, it can result in a maximum throughput of.

   A.) 2400 bps
   B.) 4800 bps
   C.) 9600 bps
   D.) 14 400 bps

Answer: Option 'C'

9600 bps

16.

The receive equalizer reduces delay distortions using a _______.

   A.) difference engine
   B.) tapped delay lines
   C.) descrambler
   D.) gear shift

Answer: Option 'B'

​tapped delay lines

17.

Satellite in geosynchronous orbit…

   A.) remains in a fixed position relative to points on earth
   B.) can cover about 80
   C.) moves faster than the earth’s rotation so that it can cover a larger portion of the earth
   D.) remains in a fixed position so as the earth rotates it can fully cover the earth.

Answer: Option 'D'

remains in a fixed position so as the earth rotates it can fully cover the earth.

18.

The basic component necessary for communication is a ________.

   A.) computer terminal
   B.) modem
   C.) communications software
   D.) all of these

Answer: Option 'C'

communications software

19.

A central computer surrounded by one or more satellite computers is called.

   A.) bus network
   B.) ring network
   C.) star network
   D.) none of these

Answer: Option 'C'

star network

20.

When the index of refraction is greater in Material 1 than it is in Material 2, the velocity of propagation in Material 1 compared to Material 2 is _______.

   A.) equal or greater
   B.) greater
   C.) lesser
   D.) equal

Answer: Option 'C'

lesser


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