Elara Vance, a senior network security administrator managing FortiNAC deployments, faces a critical juncture. The organization has mandated an accelerated transition to a zero-trust network access model, requiring immediate reconfiguration of existing NAC policies to accommodate a significantly larger remote workforce. Simultaneously, a critical vulnerability has been identified in a legacy application that requires immediate isolation of affected endpoints. Given these competing demands and the inherent ambiguity in defining granular access policies for a diverse set of devices and user roles within the new framework, which behavioral competency is most crucial for Elara to effectively navigate this complex and dynamic situation?