Which port and protocol is used for FTP control connections?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port and protocol is used for FTP control connections?

Explanation:
FTP uses a dedicated control channel to send commands and receive replies, and that channel must be reliable and orderly, which is why it runs over TCP. The standard port for this FTP control connection is 21. In contrast, the data transfer channel uses port 20 in active mode (or an ephemeral port negotiated in passive mode), so port 20 is not the control connection. The other options correspond to different services: port 23 is used by Telnet, and port 67 UDP is used by DHCP.

FTP uses a dedicated control channel to send commands and receive replies, and that channel must be reliable and orderly, which is why it runs over TCP. The standard port for this FTP control connection is 21. In contrast, the data transfer channel uses port 20 in active mode (or an ephemeral port negotiated in passive mode), so port 20 is not the control connection. The other options correspond to different services: port 23 is used by Telnet, and port 67 UDP is used by DHCP.

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