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Diagram
of the TCP/IP Model - Application Layer |
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| The Application
Layer |
| In TCP/IP the Application Layer also includes
the OSI Presentation Layer and Session Layer. In this document
an application is any process that occurs above the Transport
Layer. This includes all of the processes that involve user
interaction. The application determines the presentation of
the data and controls the session. In TCP/IP the terms socket
and port are used to describe the path over which
applications communicate. There are numerous application level
protocols in TCP/IP, including Simple Mail Transfer Protocol (SMTP)
and Post Office Protocol (POP) used for e-mail, Hyper Text
Transfer Protocol (HTTP) used for the World-Wide-Web, and File
Transfer Protocol (FTP). Most application level protocols are
associated with one or more port number.
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