CompTIA
220-802 · Question #968
220-802 Question #968: Real Exam Question with Answer & Explanation
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
Explanation
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.
Common mistakes.
- A. 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.
- C. 192.168.0.1 is a private LAN address commonly used as a default gateway and is not a loopback address.
- D. 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
Reference. https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ping
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