Which protocol uses UDP port 69 for file transfer?

Which protocol uses UDP port 69 for file transfer?

• A. Network Time Protocol (NTP)
• B. Trivial File Transfer Protocol (TFTP)
• C. Post Office Protocol 3 (POP3)
• D. SSH

Answer: (B)

TFTP is a simple file transfer protocol that runs over UDP and is designed for minimal overhead. It uses UDP port 69 for the initial request to transfer a file. After the request, the actual data transfer typically happens on a separate ephemeral port chosen by the server, but the starting point is port 69. The other options don’t fit because they use different protocols and ports: NTP uses UDP 123 for time synchronization, POP3 uses TCP 110 for email retrieval, and SSH uses TCP 22 for secure remote access.

TFTP is a simple file transfer protocol that runs over UDP and is designed for minimal overhead. It uses UDP port 69 for the initial request to transfer a file. After the request, the actual data transfer typically happens on a separate ephemeral port chosen by the server, but the starting point is port 69. The other options don’t fit because they use different protocols and ports: NTP uses UDP 123 for time synchronization, POP3 uses TCP 110 for email retrieval, and SSH uses TCP 22 for secure remote access.