In IPS, a fundamental technique to determine if an intrusion is in progress in a stable network is:

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In IPS, a fundamental technique to determine if an intrusion is in progress in a stable network is: anomaly detection.

Since the question provides no answer options to analyze, we focus on the concept mentioned as correct. Anomaly detection in an intrusion prevention system involves establishing a baseline of normal network and host behavior and then flagging deviations from that baseline. When traffic or activity diverges from expected patterns—such as unusual connection attempts, atypical traffic volumes, or unexplained protocol usage—the IPS can raise alerts or take action to block or mitigate potential intrusions.

Why anomaly detection is central in this context:
- It excels at catching unknown or zero-day attacks because it does not rely on known attack signatures but on deviations from normal behavior.
- It can monitor multiple dimensions, including packet headers, payload characteristics, timing, and sequence patterns, enabling the system to detect subtle or novel malicious activity.
- In a stable network, anomalies stand out against a consistent baseline, making in-progress intrusions more detectable as soon as the attacker changes behavior (e.g., unusual beaconing, data exfiltration patterns, or privilege escalation attempts).

However, it’s important to recognize limitations:
- Anomaly detection can generate false positives if the baseline drifts due to legitimate changes in the environment.
- It requires careful baseline modeling, tuning, and ongoing maintenance to remain effective.
- It may be complemented by signature-based detection to catch known threats and by stateful inspection to monitor ongoing sessions for policy violations.

In summary, anomaly detection is a core technique in IPS for identifying in-progress intrusions within a stable network because it focuses on deviations from normal behavior, enabling detection of novel or unforeseen attack patterns.

25SP - MIS564 A (on-campus) Module 7 Practice Quiz 11

In IPS, a fundamental technique to determine if an intrusion is in progress in a stable network is:

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