Definition Edit

The Application Layer is the topmost layer in the OSI and TCP/IP network models, where applications can exchange data without regard for underlying Network Layers.

Overview Edit

Applications such as e-mail readers and Web browsers interface with the application layer to transmit data over TCP/IP networks. There are application-level protocols such as Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP) for email; Hyper Text Transfer Protocol (HTTP) for the Web; File Transfer Protocol (FTP) for file transfers; and Real-Time Transport Protocol/Real-Time Control Protocol (RTP/RTCP) for delivery of audio and video streams.

Application-level protocols also have a port number that can be thought of as an identifier for a specific application. For example, port 80 is associated with HTTP or a Web server.[1]

References Edit

  1. Technology Assessment: Cybersecurity for Critical Infrastructure Protection, at 144.

See also Edit

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