A TCP segment consists of two sections:
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 offset | Bits 0–3 | 4–7 | 8–15 | 16–31 |
|---|
| 0 | Source port | Destination port |
| 32 | Sequence number |
| 64 | Acknowledgment number |
| 96 | Data offset | Reserved | CWR | ECE | URG | ACK | PSH | RST | SYN | FIN | Window |
| 128 | Checksum | Urgent pointer |
| 160 | Options (optional) |
| 160/192+ |
Data
|
- Source port (16 bits) – identifies the sending port
![[2]](http://freebie.fatpipe.org/~mjb/Drawings/TCP_Header.png){kind=link}
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