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Suppose that the five measured SampleRTT values are 106 ms, 120 ms, 140 ms, 90 ms, and 115 ms.

a. 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.
b. Compute also the DevRTT after each sample is obtained, assuming a value of β=0.25 and assuming the value of DevRTT was 5 ms just before the first of these five samples was obtained. Last, compute the TCP TimeoutInterval after each of these samples is obtained.

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Answer:

a) 100.75,   103.15,    107.756,    105.536,   106.72

b) 5.06,    8,       14.061,       14.43,    12.89

Explanation:

Measured sample RTT values : 106 ms, 120 ms, 140 ms,  90 ms,  115 ms

First estimated RTT value = 100 ms

∝ = 0.125

β = 0.25

First DevRTT value = 5 ms

A)   Compute the EstimatedRTT after each of these SampleRTT values is obtained,

Formula for estimated RTT = ( 1 - ∝ ) . estimated RTT + ∝.sample RTT

B). Compute  the DevRTT after each sample is obtained,

Formula for DevRTT = ( 1 - β ) . DevRTT + β. | sample RTT - Estimated RTT |

attached below is a detailed solution

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The Answer will be  

Answer a) 100.75,   103.15,    107.756,    105.536,   106.72

Answer b) 5.06,    8,       14.061,       14.43,    12.89

  • After Measured the sample RTT values are:  106 ms, 120 ms, 140 ms,  90 ms,  115 ms
  • Then First estimated RTT value are = 100 ms
  1. ∝ = 0.125
  2. β = 0.25
  • secondly ,then we find DevRTT value = 5 ms

A) Then  Compute the Estimated RTT after each of these SampleRTT values is obtained, apply the formula  

  • The Formula for estimated RTT are = ( 1 - ∝ ) . estimated RTT + ∝.sample is RTT

B). Compute  the DevRTT after each sample is obtained,

  • The Formula for DevRTT are = ( 1 - β ).  Dev RTT + β. | sample RTT - Estimated RTT |

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