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Sliding Window with cumulative ACK: Error-free operation

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• Sliding Window with Cumulative ACK Example: Error Free Operation

  • Error-free operation:

    Sender: Send window = [0, 1, 2] Receiver: Receive window = [0, 1, 2] Example:

    Comments:

    Watch for this progression: Sender sends frame x Receiver receives frame x Receiver delivers the frame x Receiver window slides forward Receiver sends ACK x+1 Some times later, the sender will receive ACK x+1: Sender window now slides forward

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  • Notice that:

    At all times: The receiver window is is aligned with        or        ahead of the sender window Observe: