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file transfer protocol
(redirected from Port 21)

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A communications protocol used to transmit files without loss of data. A file transfer protocol can handle all types of files including binary files and ASCII text files. See Kermit, Zmodem and FTP.

File Transfer Protocol - (FTP) A client-server protocol which allows a user on one computer to transfer files to and from another computer over a TCP/IP network. Also the client program the user executes to transfer files. It is defined in STD 9, RFC 959.

See also anonymous FTP, FSP, TFTP.

Unix manual page: ftp(1).
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