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| Description: | User Datagram Protocol. Protocol layer sitting on top of IP. UDP does not provide a reliable data transfer service, which means that developers who require reliability when using UDP in their programs have to use other means to guarantee it (e.g. TFTP, NFS). However, UDP is used in question/answer communications (e.g. DNS). The RFC is at http://www.ietf.org/rfc/rfc768.txt. |