220-801 · Question #641
A technician notices that the PC is not receiving an IP address. Which of the following tools would the technician use to troubleshoot the computer's NIC?
The correct answer is A. Loopback plugs. A loopback plug is used to test a NIC by redirecting the card's transmitted signal back to its own receive port, confirming the card can send and receive data without requiring a live network connection.
Question
A technician notices that the PC is not receiving an IP address. Which of the following tools would the technician use to troubleshoot the computer's NIC?
Options
- ALoopback plugs
- BESD mat
- CCable tester
- DToner probe
How the community answered
(26 responses)- A73% (19)
- B8% (2)
- C4% (1)
- D15% (4)
Why each option
A loopback plug is used to test a NIC by redirecting the card's transmitted signal back to its own receive port, confirming the card can send and receive data without requiring a live network connection.
A loopback plug inserted into the RJ-45 port of a NIC allows diagnostic software or OS tools to verify the card's transmit and receive circuitry are functional. If the NIC passes a loopback test, the card itself is working and the problem lies elsewhere such as cabling, the switch, or the DHCP server.
An ESD mat dissipates static electricity to protect components during handling but provides no diagnostic capability for network connectivity.
A cable tester checks the continuity and wiring of a physical network cable but cannot test the NIC itself.
A toner probe traces the path of a cable through walls or a patch panel and is not used to verify NIC functionality.
Concept tested: Using a loopback plug to test NIC functionality
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/network-connectivity-troubleshooting
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