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Cisco Router Configuration Handbook, Second Edition by Andrew Whitaker, Steve McQuerry - CCIE No. 6108, Dave Hucaby - CCIE No. 4594

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Appendix G. Well-Known IP Port Numbers

Transport layer protocols identify higher-layer traffic with 16-bit fields called port numbers. A connection between two devices uses a source and a destination port, both contained within the protocol data unit. Figure G-1 shows the User Datagram Protocol (UDP) header format, with the source and destination port fields shaded. Figure G-2 shows the Transmission Control Protocol (TCP) header format, with the source and destination port fields shaded.

Figure G-1. UDP Datagram Format Showing Port Fields

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Figure G-2. TCP Segment Format Showing Port Fields

Both UDP and TCP port numbers are divided into the ...

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