Question

Consider a scenario where two hosts use a sliding window protocol, either Go-Back-N or Selective Repeat, to exchange data packets. Assume that the RTT is 30 milliseconds and the sending rate is R = 1Gbps, and the size of every packet is L = 2,000 bytes, including both header fields and data. (a). How big would the window size have to be for the channel utilization to be greater than 98%? (b). Assume that we use the window size calculated in (a). How many different sequence numbers do we need to guarantee that Selective Repeat can operate correctly (that is, the receiver will not be confused by whether a packet is a new packet or a retransmitted packet)? (c). Assume that we use the minimum number of sequence numbers, as indicated by (b). How many bits do we need to use (in the packet header) to represent the sequence numbers.

Answer 1

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