Classical

Computer Networks - Data Communication & Network Security

41:  

Slotted ALOHA

A.

divide time into discrete intervals

B.

require global time synchronization

C.

both (a) and (b)

D.

none of these

 
 

Option: C

Explanation :


42:  

Start and stop bits are used in serial communication for

A.

error detection

B.

error correction

C.

synchronization

D.

slowing down the communication

 
 

Option: C

Explanation :


43:  

In the carrier sense network, if prevailing condition is a 'channel busy', then technique used is

A.

non-persistent then it results in randomised wait and sense

B.

1-persistent then the channel is continually sensed

C.

 p-persistent then randomised retransmission is done

D.

both (a) and (b)

 
 

Option: B

Explanation :


44:  

The systems that can be used in both priority and non-priority modes is

A.

TDM

B.

Register insertion

C.

Carrier sense systems

D.

all of these

 
 

Option: C

Explanation :


45:  

 Number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self-connection is

A.

100

B.

45

C.

8

D.

28

 
 

Option: B

Explanation :

As all lines are full-duplex and there are no self-connections, only the cross points above the diagonal are needed. Hence formula for the number of cross points needed is  n (n -1) / 2 




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