How are BES Cyber Assets logically grouped into BES Cyber Systems?

BES Cyber Assets are logically grouped into BES Cyber Systems primarily by device type and network architecture. This approach allows for an effective understanding of how these assets interact and function within the Bulk Electric System (BES). Grouping by device type ensures that similar devices, such as turbines or transformers, which may have similar operational characteristics and security requirements, are managed and protected in a cohesive manner. Furthermore, network architecture plays a crucial role as it defines how these devices communicate with each other and with external networks, which is vital for assessing vulnerabilities and implementing security measures.

The rationale behind grouping BES Cyber Assets in this way is to facilitate effective risk management and cybersecurity practices. By understanding the configuration and interdependencies of devices within a system, organizations can adopt targeted security controls that are commensurate with the specific threats faced by those assets. This is essential for compliance with NERC CIP standards, which emphasize the identification and protection of Cyber Systems that may affect the reliability of the BES.

In contrast, grouping based solely on physical location could overlook critical relationships and connectivity of assets that have significant cybersecurity implications. Similarly, organizing by organizational hierarchy may not align with the operational or technical realities of the assets. Lastly, relying on historical performance data for grouping could fail to provide a relevant