The IP address is used to test the IP stack on an individual node. What is IP stack here ?Some blogs redirects this question to TCP/IP stack.But I am unable to co relate and understand it.

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TCP/IP Illustrated Volume 1 discusses at a high level how the loopback address works in the context of an Ethernet driver (see Chapter 2 Section 7, and diagram 2.4). The reason why pinging the loopback address is used is because it verifies the correct operation of the TCP/IP "stack" on a system without it needing to be connected to anything else. Here "stack" is used to refer to a software suite, not a conceptual model, such as the TCP/IP model.


It refers to the Internet Layer of the Internet Protocol, not specifically to TCP/IP.

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