Implement [Selection: organization-defined value] separate subnetworks to isolate the following critical system components and functions: [Assignment: critical system components and functions].
Supplemental Guidance
Separating critical system components and functions from other noncritical system components and functions through separate subnetworks may be necessary to reduce susceptibility to a catastrophic or debilitating breach or compromise that results in system failure. For example, physically separating the command and control function from the in-flight entertainment function through separate subnetworks in a commercial aircraft provides an increased level of assurance in the trustworthiness of critical system functions.