N10-005 Question #957: Real Exam Question with Answer & Explanation

The correct answer is C: Loopback plug. A loopback plug is a hardware testing tool that plugs directly into a NIC port and redirects outgoing signals back into the NIC as incoming signals. This isolates the NIC from the rest of the network and lets the technician confirm whether the NIC itself can send and receive data

Question

A computer has lost network connectivity. The network technician determines the network cable and the cable drop are both good. Which of the following would the technician use to test the computer's NIC?

Options

ACable certifier
BThroughput tester
CLoopback plug
DMultimeter

Explanation

A loopback plug is a hardware testing tool that plugs directly into a NIC port and redirects outgoing signals back into the NIC as incoming signals. This isolates the NIC from the rest of the network and lets the technician confirm whether the NIC itself can send and receive data. Since the cable and cable drop were already ruled out, testing the NIC is the logical next step. A cable certifier tests cable quality and wiring standards; a throughput tester measures network bandwidth; a multimeter measures electrical voltage, current, and resistance-none of which directly test NIC functionality.

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