The tools available to IT security professionals are becoming more proactive by attempting to prevent, rather than only detect, exploits from damaging critical assets. Intrusion prevention, in particular, has received a lot of attention in the IT press in the last several years. This paper will explore Intrusion Protection Systems (IPS) from the perspective of using IPS as part of a Defense in Depth strategy. First we will describe Defense in Depth. We will then explore various components of a traditional Defense in Depth architecture. This paper will explain the various technologies of IPS. We will conclude with a discussion of what these tools can and cannot do in a comprehension security program.
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