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ISACA Certified Information Systems Auditor · Isaca
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When reviewing an intrusion detection system (IDS), an IS auditor should be most concerned about the IDS failing to detect actual attacks, as this leaves the organization vulnerable to security breaches without any warning or response
answer is D. IDS cannot prevent/block the attack. that's IPS function.
Attacks that are not identified by the system are at higher risk because they are unknown and no action is taken to address them.