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Consider the alternating-bit (also known as stop-and-wait [or rdt3.0]) protocol. Draw a diagram that shows that if the network connection between the sender and receiver can reorder messages (that is, that two messages propagating in the medium between the sender and receiver can be reordered), then the alternating-bit protocol will not work correctly (make sure you clearly identify the sense in which it will not work correctly). Your diagram should have the sender on the left and the receiver on the right, with the time axis running down the page, showing data (D) and acknowledgement (A) message exchange. Make sure you indicate the sequence number associated with any data or acknowledgement segment.
| © Björn Victor Senast ändrad: Tue, 10-Sep-2002 15:21 MEST |
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