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Sender:

• k-bit seq # in pkt header

• “window” of up to N, consecutive unack’ed pkts allowed

• ACK(n): ACKs all pkts up to, including seq # n - “cumulative ACK”
  • may deceive duplicate ACKs (see receiver)

• timer for each in-flight pkt

• timeout(n): retransmit pkt n and all higher seq # pkts in window

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