Implementing Cisco Collaboration Devices (CICD, legacy) — Question 37

While trying to register to Cisco UCM, a Cisco IP phone reports TFTP authorization failure. Which cause of this issue is true?

Answer options

• A. DHCP option 150 has the incorrect TFTP address configured.
• B. The phone has a cabling issue.
• C. The TFTP address for the phone is not in the CTL file.
• D. A firewall in the network is blocking access.

Correct answer: A

Explanation

The correct answer is A because if DHCP option 150 is incorrectly set, the phone won’t receive the right TFTP server address, leading to authorization failure. Option B is incorrect as cabling issues would typically cause connectivity problems, not specifically TFTP authorization failures. Option C is also not the right answer since the CTL file is related to security, and while it can affect registration, it does not directly lead to an authorization failure. Option D is incorrect because while a firewall could block traffic, the specific issue here is related to the TFTP address configuration.