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1 FTP and SFTP Configuration
Introduction to FTP and SFTP
Introduction to FTP
FTP (file transfer protocol) is commonly used in IP-based networks to transmit files. Before World Wide
Web comes into being, files are transferred through command lines, and the most popular application is
FTP. At present, although E-mail and Web are the usual methods for file transmission, FTP still has its
strongholds.
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 FTP
operations are described in RFC 959.
FTP-based file transmission is performed in the following two modes:
z Binary mode for program file transfer
z ASCII mode for text file transfer
A 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 FTP
Item Description Remarks
FTP server
An Ethernet switch can operate as an FTP server to
provide file transmission services for FTP clients.
You can log in to a switch operating as an FTP
server by running an FTP client program on your PC
to access files on the FTP server.
FTP client
In this case, you need to establish a connection
between your PC and the switch through a terminal
emulation program or Telnet, execute the ftp
X.X.X.X command on your PC. (X.X.X.X is the IP
address of an FTP server or a host name), and enter
your user name and password in turn. A switch can
operate as an FTP client, through which you can
access files on the FTP server.
The prerequisite is that
a route exists between
the switch and the PC.
Introduction to SFTP
Secure FTP (SFTP) is established based on an SSH2 connection. It allows a remote user to log in to a
switch 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.
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