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.
Show Hint
- Longer link length and lower transmission rate
- Longer link length and higher transmission rate
- Shorter link length and lower transmission rate
- Shorter link length and higher transmission rate
The Correct Option is B
Solution and Explanation
When the link length is longer, the round-trip time increases, and even with a higher transmission rate, the time spent waiting for an acknowledgment can still dominate the utilization. This leads to lower link utilization, as the sender spends more time waiting than actually sending data. Therefore, in this case, the utilization is the lowest when the link length is longer and the transmission rate is higher (option B).
Thus, the correct answer is (B): Longer link length and higher transmission rate.
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