CompTIA: Advanced Security Practitioner (CASP) Exam Prep

Answer - D - A security perimeter is an imaginary boundary that divides the trusted from the un-trusted components. For a system to stay in a secure and trusted state, precise communication standards must be developed to ensure that when a component with in the TCB needs to communicate with a component outside the TCB, the communication cannot expose the system to unexpected security compromise. This type of communication is handled and controlled through interfaces.