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

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16-03-2021
Computers and Technology

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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

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ogorwyne ogorwyne · Answer 1 · 2021-03-17T19:23:43+01:00

Answer:

Selective Repeat protocols

Explanation:

It is better to make use of the selective repeat protocol here. From what we have here, there is a high error rate on this channel.

If we had implemented Go back N protocol, the whole N packets would be retransmitted. Much bandwidth would be needed here.

But we are told that bandwidth is limited. So if packet get lost when we implement selective protocol, we would only need less bandwidth since we would retransmit only this packet.