Question

Suppose there are 4 packets to be sent out at the sender. During the transmission, the...

Suppose there are 4 packets to be sent out at the sender. During the transmission, the second packet is lost. All other packets and ACKs are received correctly. We assume the packet transmission takes 2 minutes, the RTT is 20 minutes, the timer is 35 minutes. Draw a diagram to illustrate the packet and ACK transmission sequence and the specific time for each packet receiving and ACK receiving using (a) stop-and-wait protocol, (b) Go-back-N protocol with N=3. Note you need to draw two diagrams!


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Answer #1

In stop and wait protocol, one segment is sent at a time and then wait for acknowledgement. After successful receive of acknowledgement, next frame is sent. In go back N, all N frame are sent at a time and then if any segment is lost in window N then all the frames from lost segment to end of window is resent.

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