Nothing in particular. Remember, 127.0.0.1 (localhost) is assigned to an internal pseudo-NIC called a "loopback device." 1,2, or a hundred more network cards are just bound to additional addresses and respond to requests made on them.
TCP/IP can be verified as installed and operating by using the 'ping' command against the localhost address: ping 127.0.0.1 or ping localhost
PING
This ping command checks that the TCP/IP stack is installed and working correctly.
It simply tests whether the TCP/IP stack is correctly installed.
IP is properly installed on the host.
There are a couple of ways to stop a ping of death. If you have an anti-virus and firewall installed on your PC this will prevent this from happening. Also because a ping of death can cause your PC to freeze up you can reboot to fix this issue.
C: Attempt to ping the loopback address.
Is the Windows Firewall enabled, or any other Firewall installed and not configured?
Attempt to ping the loopback address
To check whether TCP/IP is correctly installed. 127.0.0.1 refers to your local machine, so if TCP/IP works, the ping should always be successful.
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If the ball hits the net on the serve during a game of ping pong, it is considered a let and the serve is replayed.