Andrew S. Tanenbaum Edition 5th Exercise 6 Question 32 (Page No. 609)

Question

If the TCP round-trip time, RTT, is currently 30 msec and the following acknowledgements
come in after 26, 32, and 24 msec, respectively, what is the new RTT estimate
using the Jacobson algorithm? Use α = 0.9.

Comments

Data is insufficient. Initial Deviation needs to be mentioned in the question.

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They are just asking about new RTT, not TO(Time Out) . So we do not need deviation at all.

New RTT after calculation would be = 29.256 msec

Answer 1

Reference : https://www.chegg.com/homework-help/tcp-round-trip-time-rtt-currently-30-msec-following-acknowle-chapter-6-problem-32p-solution-9780133072624-exc

Answer 2

new RTT(i.e for second frame)=α RTT+(1-α )arrival RTT(of the first frame which is given as 26ms)

SO new RTT=29.6ms