Answer:
Fault tolerant system
Step-by-step explanation:
Fault tolerance is the property that keeps a system operating properly in the event of a failure of one of the components within the system
A fault tolerant system enables the system to continue its operation possibly at a reduced level, rather than having the whole system breakdown.
A good security expert understands the need for fault tolerance in a comprehensive security system, as the absence of this can lead to serious security breaches once the whole system is down.