N10-005 Question #418: Real Exam Question with Answer & Explanation

The correct answer is A: Duplicate IP address. A duplicate IP address means two devices share the same IP on the same network. When both are connected simultaneously, an IP conflict occurs - each device receives ARP replies meant for the other, causing communication failures for both. When one device is removed, the conflict

Question

Two workstations are unable to communicate on the network despite having known good cables. When one device is unplugged from the network the other device functions properly. Which of the following could be the cause of this failure?

Options

ADuplicate IP address
BIncorrect subnet mask
CIncorrect gateway
DWrong DNS

Explanation

A duplicate IP address means two devices share the same IP on the same network. When both are connected simultaneously, an IP conflict occurs - each device receives ARP replies meant for the other, causing communication failures for both. When one device is removed, the conflict disappears and the remaining device works normally. This perfectly matches the described symptom. An incorrect subnet mask or wrong gateway would prevent communication regardless of how many devices are online, and a wrong DNS setting would affect name resolution but not basic network connectivity between workstations.

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