Which port and protocol is used for FTP data 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 data connections?

Explanation:
FTP uses TCP and establishes a separate data connection alongside the control channel. In the traditional active FTP data transfer, the data connection is created by the server from its port 20 to the client’s chosen port for data, so the data path uses TCP with source port 20. This is why port 20 TCP is the best fit for FTP data connections. (In passive FTP, the data connection uses a dynamically chosen port on the server, not port 20, so the rule doesn’t apply there.)

FTP uses TCP and establishes a separate data connection alongside the control channel. In the traditional active FTP data transfer, the data connection is created by the server from its port 20 to the client’s chosen port for data, so the data path uses TCP with source port 20. This is why port 20 TCP is the best fit for FTP data connections. (In passive FTP, the data connection uses a dynamically chosen port on the server, not port 20, so the rule doesn’t apply there.)

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