Question

We want to implement a data link control protocol on a channel that has limited bandwidth...

We want to implement a data link control protocol on a channel that has limited bandwidth and high error rate. On the other hand, the communication equipment has high processing power and large buffering capacity. Assume that off-the-shelf software is available for two protocols, the Go Back N and the Selective Repeat protocols. Which one is better in this situation?
a. They are equally good.

b. Selective repeat.

c. Go back N.

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Answer #1

SOL:

Selective repeat protocol is better in this situation

so option b is correct

Explanation:

They mentioned in the given data that the channel has high error rate . suppose if we implement Go Back N protocol and if a packet gets Lost then we need to retransmitt the entire window of N packets which requires a lot of Bandwidth. But they mentioned channel has Limited Bandwidth

If we implement selective repeat protocol over channel and if a pcket gets Lost then we selectively retransmitt that packet only this requires a less bandwidth .

so Selective repeat protocol is better in this situation compared to Go Back N protocol

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