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How does it work? Does it typically have predefined patterns of trusted or malicious activity? Is it actually a category of firewall techniques? I am more curious about Cisco than I am about other products..

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Cisco IPS basically uses "signatures" which are nothing more than regular expressions.

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That link is most helpful! Thanks! – George Bailey Jan 5 '11 at 18:08
Of course. I'm not always crotchety.. – GregD Jan 5 '11 at 18:16
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