There are other important roles that the Sequence and Acknowledgement numbers have during the communication of two hosts. Because segments (or packets) travel in IP datagrams, they can be lost or delivered out of order, so the receiver uses the sequence numbers to reorder the segments. The receiver collects the data from arriving segments and reconstructs an exact copy of the stream being sent.
If we have a closer look at the diagram above, we notice that the TCP Acknowledgement number specifies the sequence number of the next segment expected by the receiver.
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