Which port is used for FTP data transfer?

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Prepare for the CPSA Port Numbers exam with multiple choice questions and detailed explanations. Understand key protocols and services to excel in your test.

Multiple Choice

Which port is used for FTP data transfer?

Explanation:
FTP uses two separate connections: a control channel for commands and a data channel for transferring files. The control connection is typically on port 21, while the data connection uses port 20 in the standard active FTP mode. In passive FTP, the server selects a random high-numbered port for data, so there isn’t a single fixed data port. Among the options, 20 is the conventional data port for active FTP, whereas 21 is the control port and 989/990 relate to FTPS (FTP over TLS).

FTP uses two separate connections: a control channel for commands and a data channel for transferring files. The control connection is typically on port 21, while the data connection uses port 20 in the standard active FTP mode. In passive FTP, the server selects a random high-numbered port for data, so there isn’t a single fixed data port. Among the options, 20 is the conventional data port for active FTP, whereas 21 is the control port and 989/990 relate to FTPS (FTP over TLS).

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