What defines a Security Domain?

A Security Domain is defined as a set of system resources and entities that operate under a common policy. This concept is central to cybersecurity because it allows for the classification and management of those resources that share similar security requirements, access controls, and operational guidelines. By grouping related system components together, organizations can implement tailored security measures more effectively, ensuring that all resources within the domain adhere to the same rules and safeguards.

This understanding is foundational for compliance frameworks such as the Cybersecurity Maturity Model Certification (CMMC), where clear delineation of security boundaries is vital for assessing risks and applying appropriate controls. Security domains facilitate the organization and management of security protocols, making it easier to monitor compliance and enforce policies across the identified resources.