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.
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
In the Stop-and-Wait protocol, the sender sends a single frame and then waits for an acknowledgement from the receiver before sending the next frame.
Longer link length leads to higher propagation delay.
Acknowledgement is a small frame that does not require, a higher bandwidth. While waiting for the acknowledgement higher bandwidth is not properly being utilized.
Option B is the correct answer, Longer link length and higher transmission rate lead to the lowest link utilization.