My question is about this case : I have a PC with 2 NIC (Network interface card ) , when I do ( ping ** which nic will be the ping tested on ? **

  • Unfortunately, questions about hosts/servers are off-topic here. You could try to ask this question on Super User. – Ron Maupin Dec 31 '20 at 0:50

The localhost loopback is an entirely virtual interface. There is no hardware.

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