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For stop-and-wait flow control, for n data packets sent, how many acknowledgments are needed ?

  • A.n
  • B.n-1
  • C.2n
  • D.n + 1

Answer: A

Correct answer: n

In stop-and-wait the sender transmits one frame and waits for its acknowledgement before sending the next, so n frames require n acknowledgements. Grouping them is what the sliding-window protocols allow.

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