Hardware Loopback Connections
A loopback is a means of testing signal transmission. In addition to using the built-in software loopback in TCP/IP, you can also create a hardware-based loopback connection, which crosses the computers transmit to its receive, receive to transmit, etc. This is useful to test that a computers NIC is functioning, if other computers on the LAN can talk to each other but not to that computer, and if youve already verified the TCP/IP installation via ping 127.0.0.1.
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