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Securing Your Business with Cisco ASA and PIX Firewalls by Greg Abelar

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Understanding Defense in Depth

Defense in depth is the key to stopping most network and computer-related attacks. It's a concept of deploying several layers of defense that mitigate security threats. As discussed in Chapter 1, “Internet Security 101,” many hackers look for what is called “low-hanging fruit” (that is, easy targets to attack). With defense applied, attackers usually either become frustrated and move on to the next target or stop the attacks altogether, deterred by the security you've put in place.

Stopping a Computer Attack

Although security experts debate the different methods to deploy defense in depth, each method involves the same technologies. The deployment of defense in depth used throughout this book involves four main ...

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