Connected: An Internet Encyclopedia

 Wednesday 20 August 2008 18:25:03 1219256703

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UDP Protocol Overview

UDP, documented in RFC 768, provides users access to IP-like services. UDP packets are delivered just like IP packets - connection-less datagrams that may be discarded before reaching their targets. UDP is useful when TCP would be too complex, too slow, or just unnecessary.

UDP provides a few functions beyond that of IP:

• Port Numbers. UDP provides 16-bit port numbers to let multiple processes use UDP services on the same host. A UDP address is the combination of a 32-bit IP address and the 16-bit port number.

• Checksumming. Unlike IP, UDP does checksum its data, ensuring data integrity. A packet failing checksum is simply discarded, with no further action taken.

Connected: An Internet Encyclopedia
UDP Protocol Overview

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