Which protocol uses UDP exclusively for transport among the options?

Which protocol uses UDP exclusively for transport among the options?

• A. DNS
• B. DHCP
• C. FTP
• D. TFTP

Answer: (D)

UDP is a lightweight, connectionless transport that works well for simple, fast exchanges without the overhead of establishing a connection. TFTP is built to operate over UDP only, sending small blocks of data and relying on the protocol’s own minimal mechanisms for reliability. It never uses TCP, which is why it’s described as using UDP exclusively for transport. By contrast, DNS can use UDP for most queries but may switch to TCP for large responses or zone transfers, and FTP uses TCP for reliable file transfer, so they’re not UDP-exclusive.

UDP is a lightweight, connectionless transport that works well for simple, fast exchanges without the overhead of establishing a connection. TFTP is built to operate over UDP only, sending small blocks of data and relying on the protocol’s own minimal mechanisms for reliability. It never uses TCP, which is why it’s described as using UDP exclusively for transport. By contrast, DNS can use UDP for most queries but may switch to TCP for large responses or zone transfers, and FTP uses TCP for reliable file transfer, so they’re not UDP-exclusive.