ReliableDelivery-II

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1 Sequence Numbers To distinguish between frames, we add a sequence number to each frame. Frame messages are of the form frame(i) where i is a sequence number. o frame(0) is the first data message, frame(1) is the next data message, frame(2), frame(3), frame(4), etc. The receiver sends acknowledgments to the sender, indicating which frames it has received. If the sender does not receive an acknowledgment for a message: o it retransmits the frame o uses the same seque nce number  it used the first time it sent this message (the sequence number of a message never changes)

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