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Note: Hard loopback tests are intrusive and will impact service. In a hard loopback, a special loopback plug is used in order to loop the traffic from the T1 port back into the T1 port. This figure illustrates the setup for hard loopback.
up vote 9 down vote. A loopback address is connected to a virtual network card in your machine called the loopback adapter. Anything sent to the virtual loopback adapter comes right back out of it. It's like it's connected to itself.. For example, if I make a web request by typing http://127.0.0.1/somesite.html in my browser, that request goes through the (virtual) loopback adapter and then right back out of it.