Intrusion Detection Systems (IDS) monitor network traffic and system activities for malicious activities or policy violations. IDS can be classified as anomaly-based, signature-based, host-based or network-based. Anomaly-based IDS detect novel attacks but generate many false alarms, while signature-based IDS detect known attacks but miss novel ones. Future IDS aim to integrate network and host-based detection and detect novel attacks rather than just specific signatures. IDS help secure networks from intrusions but also have drawbacks like false alarms, inability to detect new threats, and complexity.
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