During a security review you inventory three existing measures: 1) an access control list that restricts who can open specific folders on the file server, 2) a network-based intrusion detection system that records and reports suspicious traffic, and 3) nightly backups that are encrypted and shipped to an off-site vault. Which sequence of control categories correctly classifies these three measures in the order listed?
Security controls are commonly grouped by the function they perform.
Preventive controls are designed to stop an unwanted event from occurring. An access control list (ACL) blocks unauthorized users from opening protected files, so it is preventive.
Detective controls identify or record events after they have begun. An intrusion detection system (IDS) monitors traffic and generates alerts, making it detective.
Corrective controls help restore normal operations after an incident. Off-site backups are used to recover data following loss or corruption, so they are corrective.
Therefore, the correct classification, in the order ACL, IDS, off-site backups, is Preventive, Detective, Corrective. The other sequences mix up these established definitions and are incorrect.
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What is the role of an access control list (ACL) in security?
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How does a network-based intrusion detection system (IDS) function?
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Why are encrypted off-site backups considered corrective controls?
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