Application Layer
Application Layer or Process Layer is a hierarchy of protocols, TCP / IP as the Standard DoD - Reference Model, which, when taken relative to the standards of the OSI - Reference Model is on the top floor, called Process Layer of the DoD - Model will Working two pages, compared with Application Layer and Presentation Layer of the OSI - Reference Model in this class to support the work of the Application other things such as when a machine Client Application to request Download File via the Internet may be run. FTP Client program such as general program WS_ftp to connect with the FTP process is available on the machine Server. Then the process will run the FTP protocol, FTP (File Transfer Protocol) to transfer this file to the Client machine, etc., or if the user wants to run the computer from the far away. By using Telnet machine Server provides a process Telnet running, it runs the protocol Telnet to connect together, or if a run Web Browser such as Internet Explorer to browse Web pages in the site. NASA's Web of the machines, NASA will have a process HTTP (HyperTextTransfer Protocol) is running and the user interface through the HTTP protocol and so on.
The Application of Different Process Layer is at this and have intercourse but only according to the protocol used by the Application of the Process Layer of TCP / IP protocol support to work in many other processes. And multiple protocols at once that Allows the user to open the application to many programs open at once, such as Internet Explorer to browse Web pages. With the program Outlook Express to send and receive E-Mail at the same time without having to wait for work either completed before or on the current development program, Web Browser to be able to run other protocols significantly. consequently, we can use the Web Browser based file transfer protocol, FTP. Without having to find other programs to use additional.
