| A number of protocols play a role in data communication (X.25, Frame Relay, ATM and TCP/IP). The IP (Internet Protocol) switching layer is the Internet's key protocol and permits interoperability with other networks and protocols, for example, Ethernet, X.25, Frame Relay and ATM. IP is consequently often used as a synonym for the technology as a whole. The protocols TCP, UDP and RTP are used by the various applications and requirements in the Internet, such as "File Transfer (FTP)", "e-mail (SMTP)" and "WWW".
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