User Datagram Protocol (UDP)

A set of communications protocols that encompasses media access, packet transport, session communications, file transfer, electronic mail, terminal emulation, remote file access, and network management. TCP/IP provides the basis for the Internet. The structure of TCP/IP is as follows: Process layer clients: FTP, Telnet, SMTP, NFS, DNS; Transport layer service providers: TCP (FTP, Telnet, SMTP), UDP (NFS, DNS); Network layer: IP (TCP, UDP); and Access layer: Ethernet (IP), Token ring (IP).
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Logical grouping of information sent as a network layer unit over a transmission medium without prior establishment of a virtual circuit. IP datagrams are the primary information units in the Internet. The terms “cell,” “frame,” “message,” “packet,” and “segment” are also used to describe logical information groupings at various layers of the OSI Reference Model and in various technology circles. The combination of Transport layer UDP header and payload.
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The model of interconnection in which communication takes place without first establishing a connection. Sometimes (imprecisely) called datagram. Examples: Internet IP and OSI CLNP, UDP, ordinary postcards.
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A portion of a message that contains data and the destination address; also called a datagram. Typically located at the Network layer. Logical grouping of information that includes a header containing control information and (usually) user data. Packets are most often used to refer to network layer units of data. The terms “datagram,” “frame,” “message,” and “segment” are also used to describe logical information groupings at various layers of the OSI Reference Model and in various technology circles.
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A connection-oriented protocol located at layer 4 of the OSI model. The major transport protocol in the Internet suite of protocols providing reliable, connectionoriented, fullduplex streams.
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