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CompTIA Security+ All-in-One Exam Guide, Third Edition by Chuck Cothren, Roger Davis, Dwayne Williams, Gregory White, Wm. Arthur Conklin

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Intrusion Prevention Systems

An intrusion prevention system (IPS) monitors network traffic for malicious or unwanted behavior and can block, reject, or redirect that traffic in real time. Sound familiar? It should: While many vendors will argue that an IPS is a different animal from an IDS, the truth is that most IPSs are merely expansions of existing IDS capabilities. As a core function, an IPS must be able to monitor for and detect potentially malicious network traffic, which is essentially the same function as an IDS. However, an IPS does not stop at merely monitoring traffic—it must be able to block, reject, or redirect that traffic in real time to be considered a true IPS. It must be able to stop or prevent malicious traffic from having ...

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