Data Communication and Networking MCQs

1.

What is the minimum number of wires needed to send data over it serial communication link layer?

   A.) 1
   B.) 2
   C.) 3
   D.) 4

Answer: Option 'B'

2

2.

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

3.

The interactive transmission of data within a time sharing system may be best suited to…..

   A.) simplex line
   B.) half duplex lines
   C.) full duplex line
   D.) bi-flex lines

Answer: Option 'B'

​half duplex lines

4.

Which of the following is an example of a bounded medium?

   A.) coaxial cable
   B.) wave guide
   C.) fiber optic cable
   D.) all of these

Answer: Option 'D'

all of these

5.

The area of coverage of a satellite radio beam is called its….

   A.) beam width
   B.) circular polarization
   C.) footprint
   D.) identity

Answer: Option 'C'

​footprint

6.

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.

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.

Teleprinters _________. 

   A.) are used for printing at remote locations, not for input.
   B.) offer both high-speed operation and a variety of formatting controls.
   C.) have a printer for output and a keyboard for input
   D.) are same as teletypes.

Answer: Option 'C'

​have a printer for output and a keyboard for input

10.

Which of the following statements is incorrect?

   A.) teleprocessing combing telecommunication and DP techniques in online activities.
   B.) Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line.
   C.) a half-duplex line is a communication line in which data can move in two directions, but not the same time.
   D.) batch processing is the preferred processing mode for telecommunication operations.

Answer: Option 'D'

batch processing is the preferred processing mode for telecommunication operations.

11.

What is the main difference between synchronous and asynchronous transmission?

   A.) band width required is different.
   B.) pulse height is different.
   C.) clocking is derived from the data in synchronous transmission.
   D.) clocking is mixed with data in asynchronous transmission.

Answer: Option 'C'

​clocking is derived from the data in synchronous transmission.

12.

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

13.

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

14.

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

15.

The loss in signal power as light travels down the fiber is called.

   A.) propagation
   B.) attenuation
   C.) scattering
   D.) absorption

Answer: Option 'B'

​attenuation

16.

Multiple repeaters in communication satellites are called.

   A.) detector
   B.) modulator
   C.) transponders
   D.) stations

Answer: Option 'C'

​transponders

17.

Avalanche photodiode receiver can detect bits of transmitted data by receiving.

   A.) 1 Photon
   B.) 100 photons
   C.) 10 photons
   D.) 200 photons

Answer: Option 'D'

200 photons

18.

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

19.

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

20.

The transmission signal coding method for T, the carrier is called _______.

   A.) NRZ
   B.) Bipolar
   C.) Manchester
   D.) Binary

Answer: Option 'B'

Bipolar


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