Data Communication and Networking MCQs

6.

A group of packets from a source through an X.25 packet system to sink.

   A.) arrive in the same order sent for VC, but not for PVC
   B.) arrive in the same order sent for PVC, but not for VC
   C.) arrive in the same order sent for both VC and PVC
   D.) None of these

Answer: Option 'C'

arrive in the same order sent for both VC and PVC

7.

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.

8.

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

9.

Satellite transponders contain ______. 

   A.) a receiver and transmitter designed to relay microwave transmission from one point on earth to another
   B.) a device that echoes the radiation without change from one point on earth to another
   C.) devices that transform the message sent from one location on earth to a different code for transmission to another location
   D.) all of these

Answer: Option 'A'

​a receiver and transmitter designed to relay microwave transmission from one point on earth to another

10.

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

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

Answer: Option 'B'

​entropy

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