A security administrator has configured network firewall rules to block traffic from known malicious IP addresses. What type of security control does this action represent?
Preventive
Compensating
Corrective
Detective
The correct answer is Preventive. A firewall is a preventive control because its primary function is to proactively stop an incident-in this case, unauthorized network traffic-from occurring. Corrective controls, such as restoring from a backup, are used to remediate a system after an incident has occurred. Detective controls, like an Intrusion Detection System (IDS), are used to identify incidents as they happen. Compensating controls are alternate measures used when a primary control is not feasible.
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