Which of the following is NOT a function of an Intrusion Detection System?

An Intrusion Detection System (IDS) is designed primarily to monitor network traffic and system activities for malicious activities or policy violations. Its primary functions include detecting potential security breaches, identifying security attacks, and performing detailed inspections of data packets to ensure compliance with established rules.

The function of removing important files does not align with the purpose or capabilities of an IDS. An IDS focuses on detection and alerting rather than actively engaging in remediation or modifying system operations. Its role is to provide information and alerts based on the analysis of traffic and behavior rather than taking direct action such as removing files. This distinguishes the IDS from other security mechanisms, such as Intrusion Prevention Systems (IPS), which can take proactive measures against threats.

In summary, while an IDS can help in detecting bad passwords, performing stateful inspections, and identifying security attacks, it does not have the function of removing important files, making that option the correct choice for what is NOT a function of an IDS.