220-802 · Question #466
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?
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
How the community answered
(32 responses)- A3% (1)
- B88% (28)
- C6% (2)
- D3% (1)
Why each option
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.
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.
127.0.0.1 is the IPv4 loopback address defined by the TCP/IP standard, and pinging it verifies that the network stack and NIC driver are installed and responding correctly on the local machine. It does not require the NIC to transmit any packets on the physical network, making it the ideal first test of local network stack functionality. A successful reply confirms the adapter and its driver are operational.
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.
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
Source: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ping
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