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Which of the following assertions is NOT true about pattern matching and anomaly detection in intrusion detection?
Correct Answer: C
Explanation/Reference: Explanation: Pattern matching and anomaly detection analysis activities do not work with packets. Incorrect Answers: A: Anomaly detection collects data on normal activities. This produces data. B: A pattern matching IDS uses a signature database and attempts to match all monitored events to its contents. It can only detect known attacks that are present in the database. D: Anomaly detection collects data on normal activities. Once it has accumulated enough data about normal activity, it can detect abnormal and possible malicious activities and events. References: Stewart, James M., Ed Tittel, and Mike Chapple, CISSP: Certified Information Systems Security Professional Study Guide, 5th Edition, Sybex, Indianapolis, 2011, p. 56