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IV Loopback Addressing and Connections
The special address 127.n.n.n
is reserved for the use of local loopback testing.
The typical use for this is troubleshooting. If
you type ping and get nothing, something is wrong
with the installation of TCP/IP on the local machine.
If it responds with Reply from and some data, then you know
that the TCP/IP protocol is installed and functioning. The example
shows how to use the diagnostic TCP/IP utility command PING to
test the local host (machine). Typing ping 127 followed
by any other three sets of digits valid in a TCP/IP address (conventionally
127.0.0.1) produced the successful result in the example. Using
the 127.n.n.n address allows you to perform software-based loopback
testing, meaning that we didnt have to do anything with the network
hardware itself to use it.