CompTIA
220-802 · Question #466
220-802 Question #466: Real Exam Question with Answer & Explanation
The correct answer is B: 127.0.0.1. To test that a network interface card is functioning at the software level without sending traffic onto the network, the loopback address 127.0.0.1 is used.
Question
A technician needs to ping a client's machine that the technician is working on, to ensure that the network card is functioning correctly. Which of the following IP addresses should be used?
Options
- A10.76.0.1
- B127.0.0.1
- C192.168.0.1
- D255.255.255.0
Explanation
To test that a network interface card is functioning at the software level without sending traffic onto the network, the loopback address 127.0.0.1 is used.
Common mistakes.
- A. 10.76.0.1 is a routable private IP address belonging to another host on the network and tests network path connectivity, not just the local NIC.
- C. 192.168.0.1 is typically the default gateway address of a router, and pinging it tests connectivity through the NIC to an external device rather than isolating the local adapter.
- D. 255.255.255.0 is a subnet mask value, not a valid host IP address, and cannot be pinged.
Concept tested. Using the loopback address to test NIC functionality
Reference. https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ping
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