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.
