This video describe you about Loopback IP address.
The IP address 127.0.0.1 is used to test the IP stack on an individual node and cannot be used as a valid host address. An address that sends outgoing signals back to the same computer for testing. In a TCP/IP network, the loopback IP address is 127.0.0.1, and pinging this address will always return a reply unless the firewall prevents it.

The TCP/IP stack is a complete set of networking protocols. 


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