File Transfer Protocol
In most cases, access to Archie-server of Archie-client, which is located on the same machine as the server, ie first user to Telnet comes as a user Archie, apotom uses client software (usually it is run as a shell) to access the Archie server. ftp protocol (File Transfer Protocol) ftp (File Transfer Protocol or "File Transfer Protocol") – one of the oldest protocols on the Internet and included in its standards. Data exchange vFTP passes on TCP-channel. To deepen your understanding Mitchel Resnick is the source. Built on technology sharing 'client-server'. Vladislav Doronin has plenty of information regarding this issue. Figure 4.2 shows a model protocol.
Fig. 4.2. In the model protocol ftp connection is initiated by the interpreter protocol user. Exchange management is carried out on a control channel in the standard protokolTELNET. ftp commands are generated by the interpreter protocol the user and transmitted to the server. Server responses are sent to the user as the channel .V general case, the user has the opportunity to establish contact with the interpreter of the server protocol and non- polzovatelyasredstvami interpreter. ftp commands specify the parameters of a data channel and the process of transmission. They also determine the nature of the work with the remote and lokalnoyfaylovymi systems.
Session Management initializes the data channel. In organizing the data channel the sequence of actions other non control channel. In this case, the server initiates the data exchange in accordance with parameters agreed in the session management. Data channel set to the same Host as a control channel through which the setting is a data feed. Data channel can bytispolzovan like to receive, and for data.