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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Transport Layer
Exercise:
Problems
Question:38 | ISBN:9780132856201 | Edition: 6

Question

In our description of TCP in Figure 3.53, the value of the threshold, ssthresh, is set as ssthresh=cwnd/2 in several places and ssthresh value is referred to as being set to half the window size when a loss event occurred. Must the rate at which the sender is sending when the loss event occurred be approximately equal to cwnd segments per RTT?

Explain your answer. If your answer is no, can you suggest a different manner in which ssthresh should be set?

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Answer

If the pace at which the sender is sending is approximately equal to cwnd segments per RTT then the loss event is occurring.

Sound is a variable operated at the sender side. It is used to execute a constraint on the traffic rate.

ssthresh  is also called slow start threshold. It is used to store second state value.

When a segment loss event is occurring and the TCP sender identifies the loss, then the value of ssthresh is reset.

So,  sender rate is cwnd/RTT.

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