Sliding Window Protocols

• SENDER (continued):

  • If sender does not receive ack for packet before timeout elapses, it retransmits original frame

• RECEIVER:

  • The receiver also maintains a receiving window, corresponding to the number of out-of-order frames it can accept. Frames falling outside the window are discarded without ack
  • Let RWS be the maximum receiver window size; HFA be the highest-numbered frame that will be accepted & NFE be the next frame expected

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