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    TCP and Acknowledgements

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    Question: Consider a TCP sender and receiver.

    Assume bytes 0 .. 99 have been sent, received, and acknowledged (the sender has received ack's for them). Assume the sender sends the following segments (of 20 bytes each): 100, 120, 140, 160, 180, 200.

    Assume these segments are received in the following order:


    Show me what ack is generated by the receive after receiving each of these segments. Will the sender retransmit a packet? Which one and when?

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    Solution Preview

    Ack: The ack will be the next byte sequence number the receiver expects to receive from the sender. So if the segment is of 20 bytes long, then if the receiver receives a segment with sequence number of X, then the ack will be X+20. So,

    140 --> ack: 160
    160 -->ack: 180
    120 -->ack: 140
    100 --> ack: 120
    180 ...

    Solution Summary

    In 240 words, this solution provides an explanation of how to consider a TCP sender and receiver sequence and understand the pattern of retransmission.