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Computer Science Set-1
Computer Networks
135

Computer Networks MCQ with Answers

135) Repeaters function in

physical layer

data link layer

network layer

both (a) and (b)

Answer is:

physical layer

Computer Networks MCQ with Answers

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Related Computer Networks MCQ with Answers

136) A networking system has an n layers. Application generated message of length M bytes. At each of the layer, a h-byte header is added, what fraction of the network bandwidth is filled with headers ?

M / (n x M) bytes

h x n x M bytes

(n x h) / M bytes

M / (n x m)

Answer is:

(n x h) / M bytes

137) Let the clock-driven scheme for generating initial sequence numbers is used with a 15-bit wide clock counter. The clock ticks once every 100 msec, and the maximum poacket lifetime is 60 sec. How often need resynchronization take place in the worst case

2216.8 sec

2816.8 sec

3216.8 sec

3416.8 sec

Answer is:

3216.8 sec

138) For a 1-Gbps network operating over 4000 km, the delay is the limiting factor, not the bandwidth. Consider a MAN with the average source and destination 20 km apart. At what data rate does the round-trip delay due to the speed of light equal the transmission delay for a1-KB packet

24 Mbps

36 Mbps

40 Mbps

48 Mbps

Answer is:

40 Mbps

139) A group of 2n - 1 routers are interconnected in a centralised binary tree, with a router at each tree node. Router i communicates with router j by sending a message to the root of the tree. The root then sends the message back down to j. The mean number of hops per message for large n, assuming that all router pairs are equally likely will be

n - 4

2n - 1

n - 2

2n - 4

Answer is:

2n - 4

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