User Datagram Protocol

<protocol> (UDP) Internet standard network layer, transport layer and session layer protocols which provide simple but unreliable {datagram} services.

UDP is defined in STD 6, RFC 768.

It adds a checksum and additional process-to-process addressing information [to what?].

UDP is a connectionless protocol which, like TCP, is layered on top of IP.

UDP neither guarantees delivery nor does it require a connection.

As a result it is lightweight and efficient, but all error processing and retransmission must be taken care of by the application program.

Unix manual page: udp(4).

[Postel, Jon, User Datagram Protocol, RFC 768, Network Information Center, SRI International, Menlo Park, Calif., August 1980].

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