220-802 · Question #968
Which of the following is a valid local loopback address test command?
The correct answer is B. PING 127.0.0.1. 127.0.0.1 is the IANA-reserved IPv4 loopback address used to test the local TCP/IP stack without sending traffic across any physical network.
Question
Which of the following is a valid local loopback address test command?
Options
- APING 10.10.1.1
- BPING 127.0.0.1
- CPING 192.168.0.1
- DPING 255.255.255.0
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(35 responses)- A6% (2)
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- D3% (1)
Why each option
127.0.0.1 is the IANA-reserved IPv4 loopback address used to test the local TCP/IP stack without sending traffic across any physical network.
10.10.1.1 is a routable private IP address in the Class A private range and would send packets over the network interface, not the loopback interface.
Pinging 127.0.0.1 sends packets to the loopback interface, which processes them entirely within the local machine's network stack without involving any physical NIC or network infrastructure, confirming that TCP/IP is correctly installed and functional on the local system.
192.168.0.1 is a private LAN address commonly used as a default gateway and is not a loopback address.
255.255.255.0 is a subnet mask value, not a valid host IP address and cannot be used as a ping destination.
Concept tested: IPv4 loopback address and TCP/IP stack testing
Source: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ping
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