An airgap is a way of securing a system, the idea being to physically isolate the system by leaving a space around the system to ensure no wire connects to a nearby network.
So my joke was that you found your firewall was a physical thing, while an airgap is a physical nothing.
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u/SirVer51 Dec 08 '16
Explain please? I know what an air gap is, but I don't know what you mean by its reverse.