Data Communication and Networking MCQs

1.

How much power (approximately) a light-emitting diode can couple into an optical fiber?

   A.) 1 picowatt
   B.) 100 microwatts
   C.) 10 milliwatts
   D.) 10 watts

Answer: Option 'B'

100 microwatts

2.

Which of the following is not an example of data communication?

   A.) A salesman telephoning orders to the office
   B.) A teletype printing news bulletins.
   C.) A computer transmitting files to another computer
   D.) An automatic teller machine checking account balance with the bank’s computer

Answer: Option 'A'

​A salesman telephoning orders to the office

3.

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)

4.

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

5.

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

6.

Which of the following techniques needs source device and destination device in line of sight for data transfer?

   A.) LAN
   B.) Bluetooth
   C.) WAN
   D.) Infrared 

Answer: Option 'D'

Infrared 

7.

Buffering is ________. 

   A.) the process of temporarily storing the data to allow for small variation in device speeds.
   B.) a method to reduce cross-talks
   C.) storage of data within the transmitting medium until the receiver is ready to receive
   D.) a method to reduce the routing overhead

Answer: Option 'A'

the process of temporarily storing the data to allow for small variation in device speeds.

8.

Synchronous protocols.

   A.) transmit characters one at a time.
   B.) allow faster transmission than asynchronous protocols do.
   C.) are generally used by personal computers.
   D.) all of these

Answer: Option 'B'

allow faster transmission than asynchronous protocols do.

9.

Which of the following is not of the same group?

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

Answer: Option 'B'

​Apple talk

10.

Many cables have “RS-232” connectors with some wires crossed or connected to each other because _______. 

   A.) there are various RS-232 standards.
   B.) many computers and peripherals use RS-232 serial interfaces, but not as DTE-to-DCE.
   C.) asynchronous modem reverses the direction of transmitted and received data from the standard.
   D.) none of these.

Answer: Option 'B'

​many computers and peripherals use RS-232 serial interfaces, but not as DTE-to-DCE.

11.

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

12.

Which of following is a small single site network 

   A.) LAN
   B.) DSL
   C.) RAM
   D.) USB

Answer: Option 'A'

LAN

13.

If we get both local and remote echoes, every character we type will appear on the screen.

   A.) once
   B.) twice
   C.) three times
   D.) none of these

Answer: Option 'B'

twice

14.

To create a _______ personal computer can cannot together.

   A.) server 
   B.) super computer 
   C.) enterprise 
   D.) network 

Answer: Option 'D'

network 

15.

What frequency range is most affected by fog and precipitation?

   A.) 4GHz to 6GHz
   B.) 6GHz to 10GHz
   C.) above 10GHz
   D.) 2GHz to 4GHz

Answer: Option 'C'

​above 10GHz

16.

Many low-speed channels are interwove into one high-speed transmission by ______.

   A.) time-division multiplexer
   B.) frequency-division multiplexer
   C.) both (A) and (B)
   D.) none of these

Answer: Option 'A'

time-division multiplexer

17.

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

18.

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.

19.

If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is ______.

   A.) 1200 bauds
   B.) 3200 bauds
   C.) 4800 bauds
   D.) 9600 bauds

Answer: Option 'B'

3200 bauds

20.

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


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