CompTIA Network+ (N10-009) — Question 325

A VoIP phone powers up, but it is unable to receive or place calls. After connecting to another switchport, the issue is resolved. Which of the following was most likely the issue with the previous port?

Answer options

• A. The port had a half-duplex configuration.
• B. The port was in an error-disabled state.
• C. The port had an incorrect VLAN assignment.
• D. The port exceeded its PoE budget.

Correct answer: C

Explanation

The correct answer is C because VoIP phones require correct VLAN configuration for call signaling and media. If the VLAN assignment was incorrect, the phone would not be able to communicate with the voice network. The other options, while potentially problematic, would not directly cause the inability to place or receive calls as seen in this scenario.