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TCP ACKs are cumulative.

  • An Acknowledgment number of X means: “I have received bytes up to byte number X­1, next send me byte number X”
  • If any other byte in the byte stream is received, TCP will discard those – only  TCP segment with sequence number X will be accepted as legitimate

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thor asked Dec 6, 2016
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In IPV4 header total length $= 16$bits. So, max size $= 2^{16}$ which includes $20B$ of IP header.