Question

Explain the complete mechanism of selective repeat ARQ in 3, 4, and 5 sending and
receiving window size scenario and also which problems are addressed in this
scheme.​

Answer 1

Answer:

I am telling your answer please wait

Explanation:

please mark a brainlist please and follow me

⭐ Answer⭐

The go-back-n protocol works well if errors are less, but if the line is poor it wastes a lot of bandwidth on retransmitted frames. An alternative strategy, the selective repeat protocol, is to allow the receiver to accept and buffer the frames following a damaged or lost one.

Receiver must be able to accept packets out of order.

Since receiver must release packets to higher layer in order, the receiver must be able to buffer some packets.

Retransmission requests :

Implicit – The receiver acknowledges every good packet, packets that are not ACKed before a time-out are assumed lost or in error.Notice that this approach must be used to be sure that every packet is eventually received.

Explicit – An explicit NAK (selective reject) can request retransmission of just one packet. This approach can expedite the retransmission but is not strictly needed.

One or both approaches are used in practice.