A client packet with a destination port number of 69 is requesting which service?

A client packet with a destination port number of 69 is requesting which service?

• A. FTP
• B. TFTP
• C. SMTP
• D. HTTP

Answer: (B)

The destination port number of 69 is specifically assigned to the Trivial File Transfer Protocol (TFTP). TFTP is a simplified version of FTP, primarily used for transferring files in a straightforward manner without authentication. It operates over the User Datagram Protocol (UDP) and is often employed in environments where a small, lightweight file transfer mechanism is adequate, such as in bootstrapping devices (for example, when devices need to download firmware). In contrast, File Transfer Protocol (FTP), which operates on port 21, is a more complex protocol that provides login capabilities and a broader set of functionalities for file management. The other services listed—Simple Mail Transfer Protocol (SMTP) on port 25 and Hypertext Transfer Protocol (HTTP) on port 80—serve entirely different purposes, with SMTP focused on email transmission and HTTP used for transmitting web pages. Hence, the identification of port 69 directly correlates to TFTP, confirming why it is the correct answer in this scenario.

The destination port number of 69 is specifically assigned to the Trivial File Transfer Protocol (TFTP). TFTP is a simplified version of FTP, primarily used for transferring files in a straightforward manner without authentication. It operates over the User Datagram Protocol (UDP) and is often employed in environments where a small, lightweight file transfer mechanism is adequate, such as in bootstrapping devices (for example, when devices need to download firmware).

In contrast, File Transfer Protocol (FTP), which operates on port 21, is a more complex protocol that provides login capabilities and a broader set of functionalities for file management. The other services listed—Simple Mail Transfer Protocol (SMTP) on port 25 and Hypertext Transfer Protocol (HTTP) on port 80—serve entirely different purposes, with SMTP focused on email transmission and HTTP used for transmitting web pages. Hence, the identification of port 69 directly correlates to TFTP, confirming why it is the correct answer in this scenario.