Which port is commonly used for TFTP transfers?

Which port is commonly used for TFTP transfers?

• A. 69
• B. 80
• C. 21
• D. 443

Answer: (A)

TFTP uses UDP and the standard port for initiating transfers is 69. This is the well-known IANA assignment for TFTP, so clients send their read or write requests to the server on port 69, and the data transfer proceeds using the port chosen by the server for that session. The other ports listed correspond to different protocols—port 80 for HTTP, port 21 for FTP control, and port 443 for HTTPS—so they’re not used for TFTP. Knowing that TFTP starts on port 69 helps you identify the correct option quickly.

TFTP uses UDP and the standard port for initiating transfers is 69. This is the well-known IANA assignment for TFTP, so clients send their read or write requests to the server on port 69, and the data transfer proceeds using the port chosen by the server for that session. The other ports listed correspond to different protocols—port 80 for HTTP, port 21 for FTP control, and port 443 for HTTPS—so they’re not used for TFTP. Knowing that TFTP starts on port 69 helps you identify the correct option quickly.