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For a sliding window of size n-1 (n sequence numbers), there can be maximum of how many frames sent but unacknowledged ?

  • A.n -1
  • B.N
  • C.n +1

Answer: A

Correct answer: n -1

With n sequence numbers the window is limited to n−1 frames. If it were n, a completely lost set of acknowledgements would leave the receiver unable to tell a retransmission from a new frame.

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