What does CIP-007 R4 require regarding event logging?

CIP-007 R4 focuses on the requirements for event logging related to Bulk Electric System (BES) Cyber Systems. The correct answer highlights the necessity of logging events at the BES Cyber System or asset level. This ensures that all relevant activities, access attempts, and anomalies are recorded systematically, enabling effective monitoring and review of potential security incidents.

By establishing a robust logging mechanism at the asset level, organizations can accurately track changes, detect unauthorized access, and maintain comprehensive records for potential investigations or audits. This practice is crucial for cybersecurity, as it provides visibility into the operations and security posture of critical systems.

The other options do not align with the specific requirements outlined in CIP-007 R4. For instance, while reviewing logs regularly is valuable for ongoing security practices, the standard does not mandate a weekly review. Similarly, deleting logs after a defined period or sharing them with third-party services does not contribute directly to the logging requirements that CIP-007 R4 emphasizes. Thus, the requirement to log events at the BES Cyber System or asset level is foundational for effective cybersecurity management in accordance with NERC standards.