An intrusion detection system is classified as which type of countermeasure?

An intrusion detection system (IDS) is classified as a detective countermeasure because its primary role is to monitor network traffic and system activities for suspicious behavior or potential security breaches. By analyzing system logs, network traffic patterns, and other data, an IDS can identify and alert administrators to potential intrusions or policy violations in real-time.

The importance of an IDS lies in its ability to detect unauthorized access or anomalies, enabling organizations to respond swiftly to potential threats before they escalate into more significant security incidents. Being classified as a detective countermeasure means that its function is to identify and alert about security issues rather than to prevent them outright, which is the role of preventative countermeasures, such as firewalls or access control mechanisms.

Overall, the classification of an IDS as a detective countermeasure reflects its essential function in enhancing an organization's security posture by providing visibility into ongoing activities and threats within the IT environment.