DMZ Now that we’ve examined firewalls and how they work in a routing environment, we must introduce and discuss the DMZ. The DMZ gives you a buffer zone between the internal and external networks which is needed for assuring unwanted intrusions and visitors from the outside don’t make it to private network resources we don’t want exposed. So we’ll diagram a basic network environment, demonstrate a layered system of routers and firewalls of varying strengths, and show you how the DMZ provides this buffered zone of protection and why it must be configured to do that.
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