Application layer
Application layer
The application layer enables the user, whether human or software, to access the network. Application layer provides user interfaces and support for services such as electronic mail. Remote file access and transfer, share database management and other types of distributed information services. Specific services provided by the application layer include the following:
Ø Network virtual terminal. A network virtual terminal is a software version of physical terminal and allow user to log on to a remote host. To do the application creates a software emulation of a terminal at the remote host. The user's computer talk to the software terminal, which in turn talks to the host, vice versa. The remote host believes it is communicating with one of its own terminals and allows you to log on.
Ø File transfer, access and management (FTAM). This application allows a user to access files in remote host (to make change or read data), to retrieve files form a remote computer for use in the local computer, and to manage or control files in a remote computer locally.
Ø E-mail services. This application provides the basis for e-mail forwarding and storage.
Ø Directory services. The application provides distributed database sources and access for global information about various objects and services.
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