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    Selective-Reject ARQ Systems

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    Consider a selective-reject ARQ system with a window size of 3.

    a) Circle (or shade or bold) the sender window after frames 0 through 3 have been sent and ACK 2 has been received

    0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0

    b) Circle (or shade or bold) the sender windows after frames 4 through 6 have been transmitted, ACK 5 and NAK 5 are received.

    0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0

    c) After a) and b) have occurred, which frames need to be resent?

    d) After a) and b) have occurred, which frames have been acknowledged?

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    https://brainmass.com/computer-science/data/selective-reject-arq-systems-26842

    Solution Preview

    [2] Consider a selective- reject ARQ
    Posting

    Consider a selective-reject ARQ system with a window size of 3.
    =============================================
    a) Circle (or shade or bold) the sender window after frames 0 through 3 have been sent and ACK 2 has been received

    0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0

    =================================================
    Window [0,2] [3-5]
    SN
    Node A

    Node B
    RN

    Packets
    Delivered 0 1 2

    b) Circle (or shade or bold) the sender windows after frames 4 through 6 have been transmitted, ACK 5 and NAK 5 are received.

    0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0

    Window [4,6] [5,7]
    SN
    Node A

    Node B
    RN

    Packets
    Delivered 4

    c) After a) and b) have occurred, which frames need to be resent?
    5,6,7

    d) After a) and b) ...

    Solution Summary

    This job emphasizes a selective-reject ARQ system with a window size of 3.

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