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What is an anomaly-based IDS (intrusion detection system)?
It employs pattern matching, and cannot detect new or zero day attacks
It's a system that learns the typical activities of a machine or network, spots atypical activity, and may be able to detect new or zero day attacks
It uses IF/THEN programming and artificial intelligence techniques, but is ineffective at detecting new or zero day attacks
Old style IDS's used to be signature based and they were NOT intelligent. Newer IDS are anomaly based. These systems "learn" the typical activities of a machine or network, spots atypical activity, and may be able to detect new or zero day attacks. A potential downside of anomaly-based IDS's is the generation of false-positives. https://en.wikipedia.org/wiki/Anomaly-basedintrusiondetection_system
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