In a Zero Trust model, adaptive identity and policy-driven access control are crucial. Every request is evaluated against dynamic policies that consider the requesting identity, device posture, and other contextual signals. This process enforces least-privilege, need-to-know access and eliminates implicit trust. Standard static firewall rules mainly protect a network perimeter, while device-compliance checks act only as one input to an access decision; annual security-awareness training does not control access at all. Therefore, adaptive identity combined with policy-driven access control is the component that defines and enforces granular resource permissions.
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