Air Gap vs. firewall

["a burbatsky" <aburbatsky () hotmail com>]

Hi,

I am trying to get a handle on the difference between an air gap appliance 
and a firewall.

In an article in Information Security magazine, 
(//www.infosecuritymag.com/july2000/coverstory.htm)the article defines the 
following:

“A firewall is the logical disconnection of two physically connected net 
works, while a gap is a physical disconnection of two logically connected 
networks.”

Is this semantics or is there a real difference between the two?

Thanks,

/Abur




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