What is Loopback means ?

Loopback is used to check for errors or test programs that require IP. Loopback means data sent and received on 1 PC.
Can use software or hardware can create loopback, depending on which one needs to check. For example, ping 127.0.0.1 loopback test using the exchange ICMP packet data on the machine.

Loopback is the use of software when the computer does not have network card really.

For example in only 1 network card but want to install the ISA firewall edge model -> to create 1 crad lookback to internal network

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