Problem of Lost Data Packet- Time out timer helps to solve the problem of lost data packet.Īfter sending a data packet to the receiver, sender starts the time out timer. Thus, we can say- Stop and Wait ARQ Stop and Wait Protocol Time Out Timer Sequence Numbers for Data Packets and Acknowledgements Number of Sequence Numbers Required- NOTE For any sliding window protocol to work without any problem, the following condition must be satisfied- Available Sequence Numbers Sender Window Size Receiver Window Size Stop and wait ARQ is a one bit sliding window protocol where- Sender window size 1 Receiver window size 1 Thus, in stop and wait ARQ, Minimum number of sequence numbers required Sender Window Size Receiver Window Size 1 1 2 Thus, Minimum number of sequence numbers required in Stop and Wait ARQ 2. Stop and wait ARQ includes the following three extra elements. It provides a solution to all the limitations of stop and wait protocol. Working- Stop and wait ARQ works similar to stop and wait protocol.
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