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Exam N10-009 topic 1 question 353 discussion

Actual exam question from CompTIA's N10-009
Question #: 353
Topic #: 1
[All N10-009 Questions]

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?

  • 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.
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Suggested Answer: C 🗳️
by Jstark111 at May 9, 2025, 6:24 p.m.

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Jstark111
1 month, 2 weeks ago
Selected Answer: C
VoIP phones typically rely on being in the correct Voice VLAN to register with the VoIP server and function properly. If the previous switchport was assigned to the wrong VLAN (such as a data VLAN), the phone may power up (thanks to PoE) but fail to place or receive calls due to lack of proper network connectivity to the voice system.
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