To detect attempts at exploiting a vulnerability, you employ a(n) ____-based intrusion detection system.

A knowledge-based intrusion detection system is effective in detecting attempts to exploit vulnerabilities because it relies on a comprehensive database of known attack patterns and signatures. This system utilizes prior knowledge about threats and vulnerabilities, allowing it to identify deviations from established normal behaviors. By comparing incoming data to known signatures of malicious activity, the system can flag any potential security breaches based on its extensive knowledge base.

In contrast, the other choices do not serve the same purpose. An incident-based system focuses on real-time monitoring and response to specific incidents rather than proactively detecting vulnerabilities. A firewall is primarily designed to control traffic based on predetermined security rules, serving as a barrier rather than an active detection system. Finally, while behavior-based systems monitor for anomalies or unexpected behaviors, they do not rely on a predefined set of known vulnerabilities to detect exploitation attempts as effectively as knowledge-based systems do.