Thus, a Sequence Number field is necessary to ensure that missing or misordered packets can be detected and fixed. TCP is a byte-oriented sequencing protocol.
The sequence number is the first byte of the outgoing segment. If this packet is transferred to another side successfully, then the sequence number for the next packet is X+Y. The TCP Sequence Number field is always set, even when there is no data in the segment.įor example, the sequence number for this packet is X. It helps to keep track of how much data has been transferred and received.
TCP Sequence Number is a 4-byte field in the TCP header that indicates the first byte of the outgoing segment.
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