The seventh layer of the OSI Model- the Application Layer
The Application layer is the seventh layer of the OSI Model. This top layer defines the language and the syntax that a program uses to communicate with the other program. The Application layer provides the interface between the program in the system and the network. This layer provide user interfaces and support for the services like-electronic mail, remote file access, shared data base management and other type of information services.
Services provided by the application layer-
1. Network Virtual Terminal-
It is a software version of a physical terminal and allows a user to log on to a remote host. For this the application layer creates a software emulation of a terminal at the remote host. The remote host believes it is communicating with one of its own terminals and allows logging on.
2. File Transfer Access and Management (FTAM)-
This Application allows a user to access the file in a remote computer to make changes or read the data.
3. Mail Services-
This service allows transferring the email and the storage.
4. Directory services-
This application provides the distributed database source and access for global information about various objects and services.
Protocol use in the Application layer-
1. Domain Name System (DNS)-it is use to resolve the internet name in to the ip address.
2. Hypertext Transfer Protocol (HTTP)-it is used to transfer the files that make up the web pages of the World Wide Web.
3. Simple Mail Transfer Protocol (SMTP)-it is used to transfer the mail, messege and the attachments.
4. Telnet-this is a terminal Emulation protocol and is used to provide remote access to servers and networking devices.
5. File Transfer Protocol (FTP)-it is used for interactive file transfer between systems.
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