Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 18

An administrator discovered he/she was unable to use TFTP to transfer files to the router.
Which of the following describes the likely reason for this?

Answer options

• A. The TFTP service had been disabled on the router.
• B. TCP port 69 of the server had been blocked.
• C. UDP port 69 of the server had been blocked.
• D. The username and password had been modified.

Correct answer: C

Explanation

The correct answer is C because TFTP uses UDP as its transport protocol, specifically on port 69. If UDP port 69 is blocked, the TFTP transfer will fail. Options A and B are incorrect as disabling the TFTP service or blocking TCP port 69 does not directly affect TFTP operations, and option D is irrelevant since TFTP does not require authentication.