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N10-009 · Question #529

N10-009 Question #529: Real Exam Question with Answer & Explanation

The correct answer is A: MAC address of the new card. Switch ports secured with features like port security often allow only specific MAC addresses. Installing a new NIC changes the MAC address, which can prevent the host from connecting if the switch does not recognize the new address.

Submitted by manish99· Mar 6, 2026Network troubleshooting

Question

A network technician is working on a PC with a faulty NIC. The host is connected to a switch with secured ports. After testing the connection cables and using a known good NIC. the host is still unable to connect to the network. Which of the following is causing the connection issue?

Options

  • AMAC address of the new card
  • BBPDU guard settings
  • CLink aggregation settings
  • DPoE over power budget

Explanation

Switch ports secured with features like port security often allow only specific MAC addresses. Installing a new NIC changes the MAC address, which can prevent the host from connecting if the switch does not recognize the new address.

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