Discussion
To test the IP stack on your local host, which IP address would you ping?
Answer: C
Correct answer: 127.0.0.1
127.0.0.1 is the loopback address, and pinging it exercises the local TCP/IP stack without touching any network hardware - a reply proves the software is installed and running. 127.0.0.0 is the network address of the loopback block and 127.0.0.255 a broadcast within it; neither is the host address to test.
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