Self Doubt

Question

In Stop and Wait, how is it ensured that the sender do not consider delayed acknowledgement(of some previous frame) as actual acknowledgement for frame which was actually lost during transmission ?

Anyone please reply ..

Comments

This is a problem in the simple stop-and-wait protocol. So, as a solution, we have stop and wait ARQ.

This is resolved by introducing sequence numbers for acknowledgment.

Answer 1

In the stop-and-wait protocol, the sender only sends one frame at a time and waits for an acknowledgement before sending the next frame. This ensures that the sender does not consider a delayed acknowledgement as the acknowledgement for a different frame. The acknowledgement that the sender receives is specific to the frame that was sent, and the sender will only move on to the next frame if it receives the correct acknowledgement for the current frame.