The loopback device is sometimes explained as purely a diagnostic tool. This is important for troubleshooting (it can be compared to looking in a mirror). The loopback interface does not represent any actual hardware, but exists so applications running on your computer can always connect to servers on the same machine. When a network interface is disconnected-for example, when an Ethernet port is unplugged or Wi-Fi is turned off or not associated with an access point-no communication on that interface is possible, not even communication between your computer and itself. ![]() It is used mainly for diagnostics and troubleshooting, and to connect to servers running on the local machine. ![]() The loopback device is a special, virtual network interface that your computer uses to communicate with itself.
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