Which port and protocol is used for TFTP file transfers?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

Which port and protocol is used for TFTP file transfers?

Explanation:
TFTP is a lightweight file transfer protocol that relies on UDP to keep transfers simple and fast. The server listens for requests on UDP port 69, which is the standard or well-known port used to initiate TFTP transfers. Once a request is received, the actual data transfer happens over a separate UDP port chosen by the server for that session. This design avoids the overhead of a persistent connection, which is why UDP (not TCP) is used for TFTP. The other ports mentioned correspond to different services—UDP on port 68 is used by DHCP clients, UDP on port 53 is used by DNS—and TCP is not used for TFTP. So, the correct pairing is UDP on port 69.

TFTP is a lightweight file transfer protocol that relies on UDP to keep transfers simple and fast. The server listens for requests on UDP port 69, which is the standard or well-known port used to initiate TFTP transfers. Once a request is received, the actual data transfer happens over a separate UDP port chosen by the server for that session. This design avoids the overhead of a persistent connection, which is why UDP (not TCP) is used for TFTP. The other ports mentioned correspond to different services—UDP on port 68 is used by DHCP clients, UDP on port 53 is used by DNS—and TCP is not used for TFTP. So, the correct pairing is UDP on port 69.

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