When people talk about computer security, there’s almost always a discussion of isolating a 
computer. A machine that has sensitive data or that should only be accessed by certain people might be behind closed doors and without network access, just for the sake of safety. As someone else once put it, the only truly secure computer is one that’s in a locked room and not connected to a network (and probably not plugged in or turned on, either).
Isolating a server isn’t an all-or-nothing proposition, however. There are degrees of isolation that can be performed on a system, from simple firewalling to total physical isolation. If you’re nervous about the possible effects of having a system exposed to the outside world (or even to parts of your own organization), a partial lockdown may be every bit as effective as a total lockdown depending on your needs. Network isolation: When to pull the plug
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