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:

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.

• Selective Repeat attempts to retransmit only those packets that are actually lost (due to errors) :

• 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.