210-065 Question #330: Real Exam Question with Answer & Explanation

The correct answer is C: The TFTP address for the phone is not in the CTL file.. A TFTP authorization failure on a Cisco IP phone during UCM registration indicates the phone cannot validate the TFTP server because its address is absent from the CTL file.

Question

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

Options

AThe phone has a cabling issue.
BA firewall in the network is blocking access.
CThe TFTP address for the phone is not in the CTL file.
DDHCP option 150 has the incorrect TFTP IP address configured.

Explanation

A TFTP authorization failure on a Cisco IP phone during UCM registration indicates the phone cannot validate the TFTP server because its address is absent from the CTL file.

Common mistakes.

A. A cabling issue would cause a physical layer failure or loss of connectivity, not an authorization-level error specific to TFTP.
B. A firewall blocking access would result in a connection timeout or unreachable error, not an authorization failure message.
D. An incorrect DHCP option 150 address would prevent the phone from locating the TFTP server at all, producing a discovery failure rather than an authorization failure after contact is made.

Concept tested. Cisco UCM CTL file TFTP authorization

Reference. https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200204-Cisco-IP-Phone-Registration-Process-in-C.html

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