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Module 2: Data Link Layer & MAC Sublayer

20262m

A sender transmits frame 5 but does not receive its acknowledgement within the timeout interval. Assume the frame or its acknowledgement has been lost. What should the sender do?

  • (i) Retransmit frame 5
  • (ii) Move directly to frame 6
  • (iii) Discard all previously transmitted frames
  • (iv) Restart the entire connection
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Answer: (i) Retransmit frame 5

In ARQ protocols, when the timer expires without an ACK, the sender assumes the frame (or its ACK) was lost and retransmits the same frame. It does not move on, discard earlier frames, or restart the connection.

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