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In stop-and-wait ARQ, if data 1 has an error, then receiver sends which frame ?

  • A.NAK 0
  • B.NAK 1
  • C.NAK 2
  • D.NAK

Answer: D

Correct answer: NAK

Stop-and-wait ARQ has only one frame outstanding at a time, so a negative acknowledgement needs no sequence number: there is only one frame it could refer to. Numbered NAKs belong to the sliding-window protocols.

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