File Transfer Protocol (FTP) uses two port number to setup an FTP connection and transfer files. The ports used by FTP are ports 21 and ____.

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Multiple Choice

File Transfer Protocol (FTP) uses two port number to setup an FTP connection and transfer files. The ports used by FTP are ports 21 and ____.

FTP uses two separate connections: a control channel on port 21 for sending commands, and a data channel that historically uses port 20 as the source port when the server connects back to the client in active mode. That’s why the second port is 20. In practice, when using passive mode, the data connection uses a dynamically chosen high port instead, but the classic pairing described here is 21 and 20.

FTP uses two separate connections: a control channel on port 21 for sending commands, and a data channel that historically uses port 20 as the source port when the server connects back to the client in active mode. That’s why the second port is 20. In practice, when using passive mode, the data connection uses a dynamically chosen high port instead, but the classic pairing described here is 21 and 20.

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