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Data Link Layer MCQs - Computer Networks Objective Questions and Answers on Protocols

1 Which of the following layers of the OSI reference model resolve problems of damaged or lost or duplicate frames ?
A Data link layer
B Network layer
C Session layer
D None of the above

Answer: Option [A]
2 X.25 protocol consists of
A Physical and frame levels
B Frame and packet levels
C Physical, frame and packet levels
D None of the above

Answer: Option [C]
3 In signaling scheme, the bit error rate can be reduced by
A Increasing the bandwidth
B Decreasing the bandwidth
C Increasing data rate
D None of the above

Answer: Option [D]

In signaling scheme, decreasing the data rate can reduce the bit error rate. Increasing bandwidth will led to an increase in error rate because higher amount of data traveling at the same time. Also, if data rate is increased, they are more prone to interference from external signals.

4 How much channel throughout of slotted ALOHA will be in comparison to pure ALOHA.
A Same
B Double
C Three times
D None of the above

Answer: Option [B]
5 X.21 is physical level standard for
A X.25
C ATM networks
D None of the above

Answer: Option [A]


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