Learning the Layers :
Layer 7 : The Application Layer
It enables a user whether a human or software to access the network. It provides user interface and support for services such as e-mail, remote file access and transfer share database management, and other types of distributed information services.
Provides a set of interfaces for applications to use to gain access to networked services.
File transfer, access, and management : The application allows the user to access files in a remote host (to make changes or read data), to retrieve files from a remote computer for use in the local computer, and to manage or control files in a remote computer locally.
Mail services : The application provides the basis for e-mail forwarding and storage.
Directory services : This application provides distributed database source and access for global information about various objects and services.
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