1. Network-Based Intrusion Detection System (NIDS): A NIDS monitors network traffic for malicious activity. Example: Snort.

2. Host-Based Intrusion Detection System (HIDS): A HIDS monitors activity on an individual machine, such as system files, logs, and user activity. Example: OSSEC.

3. Wireless Intrusion Detection System (WIDS): A WIDS monitors wireless traffic for malicious activity. Example: Kismet.

4. Behavioral-Based Intrusion Detection System (BIDS): A BIDS monitors system behavior for suspicious activity. Example: Tripwire.

5. Anomaly-Based Intrusion Detection System (AIDS): An AIDS monitors system activity for abnormal patterns. Example: Bro.

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