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A TCP segment consists of two sections:

  • header

  • data

The TCP header[2] consists of 11 fields, of which only 10 are required. The eleventh field is optional (pink background in table) and aptly named "options".

TCP Header
Bit offsetBits 0–34–78–1516–31
0Source portDestination port
32Sequence number
64Acknowledgment number
128ChecksumUrgent pointer
160Options (optional)

  • Source port (16 bits) – identifies the sending port
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