Which service is associated with TCP port 21, typically used for control?

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Multiple Choice

Which service is associated with TCP port 21, typically used for control?

Explanation:
FTP uses a control channel on TCP port 21 to send commands and receive responses (such as USER, PASS, LIST, RETR). The actual file transfer occurs over a separate data channel, commonly on port 20 or on a negotiated range in passive mode. Because port 21 is specifically for the control channel, the service associated with it is FTP Control. SSH uses port 22, HTTP uses port 80, and the FTP data channel is distinct from the control channel.

FTP uses a control channel on TCP port 21 to send commands and receive responses (such as USER, PASS, LIST, RETR). The actual file transfer occurs over a separate data channel, commonly on port 20 or on a negotiated range in passive mode. Because port 21 is specifically for the control channel, the service associated with it is FTP Control. SSH uses port 22, HTTP uses port 80, and the FTP data channel is distinct from the control channel.

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