Suppose that the five measured SampleRTT values are 106 ms, 120 ms, 140 ms, 90 ms, and 115 ms. Compute the EstimatedRTT after each of these SampleRTT values is obtained, using a value of α=0.125 and assuming that the value of EstimatedRTT was 100 ms just before the first of these five samples were obtained.

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topeadeniran2 topeadeniran2 · Answer 1 · 2022-08-26T15:55:22+02:00

The computation of the estimated RTT and DevRTT is illustrated below.

The five measured sample RTT values given are 106ms, 120 ms, 140ms, 90 ms, 115ms.

Estimated RTT = 0.125 × 106 + (1 - 0.125) × 100

= 0.125 × 106 + 0.875 × 100

= 100.75ms

DevRTT will be:

= 0.25 × (106 - 100.75) + (1 - 0.25) × 5

= 0.25 × 5.25 + 0.75 × 5

= 5.0625ms

Estimated RTT after second sample will be:

= 0.125 × 120 + 0.875 × 100.75

= 103.15625ms

DevRTT after the second sample will be:

= 0.25 × (120 - 103.15625) + (1 - 0.25) × 5.0625

= 0.25 × 16.84 + 0.75 × 5.0625

= 8ms

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