Application Layer is the seventh layer in Open System Interconnection (OSI) Reference Model. Function of Application layer is to present data to users by enabling direct interaction between user and software applications. In simple words the major function of Application layer in OSI Reference Model is to provide user interface. User interface can be either command line based or GUI based. GUI based user interface is used in web browser and Command Line Interface(CLI) is used in Routers and Switches (IOS high end Routers and Switches).
Application Layer Protocols
A set of protocols are working on application layer. These application layer protocols are classified in to two.
Common Application Specific Elements (CASE) Specific Application Specific Elements (SASE)
The major Application Layer protocols are:
TelnetFile Transfer Protocol (FTP) Simple Mail Transfer Protocol (SMTP) FTAM HTTPDHCP NFSPOP3NNTPIRC
OSI Seven Layer Structure Physical layer
Data link layer
Network layer
Transport laye…
Application Layer Protocols
A set of protocols are working on application layer. These application layer protocols are classified in to two.
Common Application Specific Elements (CASE) Specific Application Specific Elements (SASE)
The major Application Layer protocols are:
TelnetFile Transfer Protocol (FTP) Simple Mail Transfer Protocol (SMTP) FTAM HTTPDHCP NFSPOP3NNTPIRC
OSI Seven Layer Structure Physical layer
Data link layer
Network layer
Transport laye…