In this problem we consider RTT estimation and timeout computation in TCP. a. Co

Question

In this problem we consider RTT estimation and timeout computation in TCP.

a. Consider a TCP session whose current values of EstimatedRTT and DevRTT are 100 ms and 15 ms, respectively. What is the current TimeoutInterval value?

b. Suppose the next measured value of SampleRTT is 120 ms. Let alpha = 1/8 and beta = 1/4 be the exponential smoothing weights. Calculate the next values of EstimatedRTT, DevRTT, and TimeoutInterval (in that order).

c. Generalize the formula for EstimatedRTT based on n sample RTTs, namely, SampleRTT1, SampleRTT2, … SampleRTTn and use alpha instead of a specific value.

Explanation / Answer

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