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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP

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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 didn’t have to do anything with the network hardware itself to use it.

Figure 41: PING 127

 

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