Application layer
The application layer is the seventh (7.) level of the seven-layer OSI model. It interfaces directly to and performs common application services for the application processes; it also issues requests to the presentation layer. The common application layer services provide semantic conversion between associated application processes. Note: Examples of common application services of general interest include the virtual file, virtual terminal, and job transfer and manipulation protocols.
Examples HTTP SMTP SNMP FTP XMPP Telnet FTAM APPC X.400 SSH X.500 IRC AFP Lightweight Directory Access Protocol (LDAP) SIP ITMS AIM
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