1-11 FTP and SFTP ConfigurationIntroduction to FTP and SFTPIntroduction to FTPFTP (file transfer protocol) is commonly used in IP-based networks to transmit files. Before World WideWeb comes into being, files are transferred through command lines, and the most popular application isFTP. At present, although E-mail and Web are the usual methods for file transmission, FTP still has itsstrongholds.As an application layer protocol, FTP is used for file transfer between remote server and local client.FTP uses TCP ports 20 and 21 for data transfer and control command transfer respectively. Basic FTPoperations are described in RFC 959.FTP-based file transmission is performed in the following two modes:z Binary mode for program file transferz ASCII mode for text file transferA Switch 4210 can act as an FTP client or the FTP server in FTP-employed data transmission:Table 1-1 Roles that a Switch 4210 acts as in FTPItem Description RemarksFTP serverAn Ethernet switch can operate as an FTP server toprovide file transmission services for FTP clients.You can log in to a switch operating as an FTPserver by running an FTP client program on your PCto access files on the FTP server.FTP clientIn this case, you need to establish a connectionbetween your PC and the switch through a terminalemulation program or Telnet, execute the ftpX.X.X.X command on your PC. (X.X.X.X is the IPaddress of an FTP server or a host name), and enteryour user name and password in turn. A switch canoperate as an FTP client, through which you canaccess files on the FTP server.The prerequisite is thata route exists betweenthe switch and the PC.Introduction to SFTPSecure FTP (SFTP) is established based on an SSH2 connection. It allows a remote user to log in to aswitch to manage and transmit files, providing a securer guarantee for data transmission. In addition,since the switch can be used as a client, you can log in to remote devices to transfer files securely.
