FTP -File Transfer Protocol

FTP is a network protocol used to transfer files from one computer to another over a TCP network. Like Telnet, it uses a client-network arhitecture, which means that a user has to have an FTP client installed to access an FTP server running on the remote machine. After establishing an FTP connection, the user can download or upload files to and from the FTP server.

 

FTP uses two TCP ports: port 20 for sending data and port 21 for sending control commands.

 

FTP can use authentication, but like Telnet, all data is sent in clear text, including usernames and passwords.