Question

Why do you need ARQ retransmission?

Answer 1

However, selective retransmission of variable length messages, when using Selective Repeat ARQ, eliminates the difficulty with delivering longer messages. ... If TCP uses Selective Acknowledgement (SACK), Selective Repeat ARQ is used.

Answer 2

Automatic repeat request. ... The types of ARQ protocols include Stop-and-wait ARQ, Go-Back-N ARQ, and Selective Repeat ARQ/Selective Reject ARQ. All three protocols usually use some form of sliding window protocol to tell the transmitter to determine which (if any) packets need to be retransmitted.

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