Final answer:
A compensating control in Security Architecture is a measure taken to mitigate a gap or vulnerability when primary controls are not feasible, providing similar protection through alternative means.
Step-by-step explanation:
In Security Architecture, a compensating control is a control that remediates a gap or flaw in another control. Compensating controls are implemented when a primary control is not feasible due to various reasons such as cost or technical constraints. Instead, another control is put in place that provides a similar level of defense. For example, if an organization cannot implement multi-factor authentication due to legacy systems, they may use stringent password policies and periodic access reviews as a compensating control to mitigate the risk.