Question 760
During a post-incident review at a research campus, the original problem was: A security policy permits an internal database flow but nobody logs denied attempts to that server due to missing log settings on the relevant deny rule. Which preventive practice most directly addresses its cause?
Explanation
Correct Answer
Check high-value deny-rule log coverage as part of segmentation audits. This control reduces recurrence of the documented mechanism: Denying sessions and recording denied attempts require explicit applicable logging settings. It creates a repeatable check around the needed response: Enable approved logging and forwarding on the matching deny rule without permitting traffic.
Incorrect Answers
Check Log Forwarding attachment for every monitored Security rule. That safeguard addresses another potential failure: Threat events appear locally in a firewall log but the SOC receives no syslog for an allowed application because its Security rule lacks a Log Forwarding profile. It is not the most targeted recurring control for the described cause: Denying sessions and recording denied attempts require explicit applicable logging settings.
Test every filter against a sample of actual generated log records. That safeguard addresses another potential failure: A SIEM team filters events by a log field whose source is not enabled, resulting in zero forwarded records despite live local traffic logs. It is not the most targeted recurring control for the described cause: Denying sessions and recording denied attempts require explicit applicable logging settings.
Audit logging at start versus end against investigative requirements. That safeguard addresses another potential failure: An outbound allow rule logs only session start even though the security team needs bytes and final application classification from session closure. It is not the most targeted recurring control for the described cause: Denying sessions and recording denied attempts require explicit applicable logging settings.