Sliding Window Protocol - Examples - The Simplest Sliding Window: Stop-and-wait - Ambiguity Example

Ambiguity Example

The transmitter alternately sends packets marked "odd" and "even". The acknowledgments likewise say "odd" and "even". Suppose that the transmitter, having sent an odd packet, did not wait for an odd acknowledgment, and instead immediately sent the following even packet. It might then receive an acknowledgment saying "expecting an odd packet next". This would leave the transmitter in a quandary: has the receiver received both of the packets, or neither?

Read more about this topic:  Sliding Window Protocol, Examples, The Simplest Sliding Window: Stop-and-wait

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