![]() Sender maintains a list of sequence numbers that it is allowed to send (sender window). If the header of the frame allows k bits, the sequence numbers range from 0 to 2k – 1. Since the sequence number to be used occupies a field in the frame, it should be of limited size. To keep track of the frames, sender station sends sequentially numbered frames. Efficiency can also be improved by making use of the full-duplex line. Efficiency can be greatly improved by allowing multiple frames to be in transit at the same time. Only one frame at a time can be in transit. With the use of multiple frames for a single message, the stop-and-wait protocol does not perform well.
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