Discussion
What is the name of the protocol in which the sender sends one frame and then waits for an acknowledgement before proceeding ?
Answer: D
The protocol is stop and wait.
In stop-and-wait, the sender transmits one frame and then waits for its acknowledgement before sending the next. It is simple but leaves the link idle while waiting, so it uses bandwidth poorly on long or fast links.
Sliding window protocols, including Go-back-N, let the sender transmit several frames before an acknowledgement arrives. Piggybacking is the technique of carrying acknowledgements on outgoing data frames, not a protocol that sends one frame at a time.
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