This paper discusses the true strength of a well-planned and maintained information security solution. Layers are built primarily by breaking networks into subnets, De-Militarized Zones (DMZs) and so on, with multiple layers of screening routers, firewalls (or typically a single perimeter firewall), implementation of Virtual Private Networks (VPNs), anti-virus solutions at the desktop or server-level, and often, a healthy sprinkling of Intrusion Detection System (IDS) to (hopefully) identify (but not prevent) any malicious traffic not caught by perimeter defenses. These are narrowly focused solutions, with no awareness of the other layers.
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