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GATE CSE 2023 Q17: When is Stop-and-Wait link utilization lowest

Question

Suppose two hosts are connected by a point-to-point link and they are configured to use Stop-and-Wait protocol for reliable data transfer. Identify in which one of the following scenarios, the utilization of the link is the lowest.

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Answer: B (official GATE 2023 final answer key)

Concept used: Stop-and-Wait utilization is 11+2a\frac{1}{1 + 2a} with a=TpropTtransa = \frac{T_{prop}}{T_{trans}}.

First step: Utilization falls as aa grows; see how link length and transmission rate change TpropT_{prop} and TtransT_{trans}.

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Source: official GATE 2023 CS question paper and final answer key, organised by IIT Kanpur. Question paper · Answer key

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