Basic knowledge of FTP server

FTP Service is one of the earliest and most important services on the network. FTP services are primarily used to transfer files, regardless of their type, as a general data file for transmission. In other words, the transmission may be graphics, sound, video and other multimedia files, but the use of FTP does not display the contents of these files, but only as a general data file for transmission. This is not the same as the HTTP service, FTP does not have the function of multimedia browsing. Below, Win7 home to explain the basic knowledge of FTP.

FTP, as a service primarily used to transfer files, has agreed on a set of standard commands to achieve this function. The remote computer uses the sentence FTP server to send commands to control the transfer of files by the remote computer.

FTP is the abbreviation for Filetransferprotocol (File Transfer Protocol), which is used to transfer files between two computers. The FTP protocol works in two ways: Port and PASV, and Chinese meaning is active and passive.

The port (Active) connection process is that the client sends a connection request to the server's FTP port (the default is 21), and the server accepts the connection and establishes a command link. When the data is needed, the server sends a connection request from Port 20 to the client's free port, creating a data link to transmit the data.

The PASV (passive) way of the connection process is that the client sends a connection request to the server's FTP port (the default is 21), the server accepts the connection, and establishes a command link. When data is needed, the client sends a connection request to the server's free port, creating a data link to transmit the data.

A special typical example is the Ie,ie default is the Port method. If you want to enable PASV mode in IE, please open IE, select in the menu: "Tool mntemet option Advanced", in the "Use Passive FTP" in front of the hook (need to IE6.0 above support), as shown in the figure.

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