Which of the following is a network intrusion detection technique?

 Statistical anomaly is a network intrusion detection technique that compares the current network activity with a baseline of normal behavior, and detects any deviations that exceed a predefined threshold. Statistical anomaly can identify unknown or novel attacks, but it may also generate false positives if the baseline is not updated or the threshold is not set properly12. References: 1: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 7, page 7702: CISSP For Dummies, 7th Edition, Chapter 7, page 237.