What does the term "defined ESP" refer to in CIP-005 R1.1?

The term "defined ESP" in CIP-005 R1.1 refers to a clearly delineated Electronic Security Perimeter. This is a critical concept within the NERC CIP standards as it pertains to the cybersecurity protection of the physical and electronic boundaries surrounding control systems and associated assets. The Electronic Security Perimeter is established to protect critical infrastructure from unauthorized access and potential cyber threats.

By identifying and clearly defining the Electronic Security Perimeter, organizations can implement specific security measures, such as firewalls, intrusion detection systems, and controlled access points, to safeguard sensitive information and systems. This delineation forms the basis for various cybersecurity protocols and practices aimed at enhancing the security posture of the system as a whole.

The other options do not accurately capture the meaning of "defined ESP." While cybersecurity guidelines, incident response frameworks, and user access tracking methods are all important components of a robust cybersecurity strategy, they do not specifically refer to the delineation of boundaries like the Electronic Security Perimeter does.