Data Communication
Final Term
Q.

At the CRC checker, ________ means that the data unit is damaged
A.  

A string of 0s

 B.  

A string of 1s

 C.  

A string of alternating 1s and 0s

 D.  

A nonzero remainder
Similar Questions
1.

The inversion of the level at 1 bit is called as __________
A.  

NRZ-L 

 B.  

NRZ-I 

 C.  

RZ 
2.

In selective-reject ARQ, only the specific damaged or lost frame is_____________.
A.  

Retransmitted

 B.  

Forwarded

 C.  

Selected

 D.  

Rejected
3.

YMODEM has _________Byte of data unit. 
A.  

1024

 B.  

256

 C.  

128

 D.  

512
4.

Which of the following sublyer, resolves the contention for the shared media
A.  

MAC

 B.  

LLC

 C.  

Physical
5.

Like 10 Base 5, 10 Base 2 is a _________ topology LAN
A.  

Ring

 B.  

Mesh

 C.  

Star

 D.  

Bus
6.

At the CRC generator, __________ added to the data unit after the division process
A.  

0s are

 B.  

1s are

 C.  

The polynomial

 D.  

The CRC remainder is 
7.

Flow control is needed to prevent ___________. 
A.  

Bit errors

 B.  

Overflow of the sender buffer 

 C.  

Overflow of the receiver buffer

 D.  

Collision between sender and receiver 
8.

In Y-MODEM Multiple files can be sent simultaneously
A.  

True

 B.  

False
9.

In 56K Modems Max Uploading speed is ______ bytes and downloading speed is ______ byte. 
A.  

40K, 56K 

 B.  

33.6K, 56K

 C.  

56K, 33.6K 

 D.  

None of given
10.

If db is amplified then attenuation is ------------------ 
A.  

Positive

 B.  

Negative

 C.  

Zero

 D.  

None of the above 
DATA COMMUNICATION TOPICS