In **Stop-and-Wait ARQ**, the sender retransmits a frame when: - (i) ACK is received - (ii) Window is full - (iii) Timeout occurs - (iv) Buffer is empty

In Stop-and-Wait ARQ, the sender retransmits a frame when: - (i) ACK i

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Module 2: Data Link Layer & MAC Sublayer

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In Stop-and-Wait ARQ, the sender retransmits a frame when:

(i) ACK is received
(ii) Window is full
(iii) Timeout occurs
(iv) Buffer is empty

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Answer: (iii) Timeout occurs

The sender starts a timer after sending a frame. If no ACK arrives before the timer expires (frame or ACK lost/corrupted), it retransmits the same frame.

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