In Zero Trust architecture, policy enforcement is conditional and context-based, not limited to a simple binary allow-or-block model. Zscaler's reference architectures explain that policy is evaluated using the full user context, including identity, device posture, location, group membership, and other conditions. Access decisions are therefore based on whether specific policy conditions are true, rather than only on static network attributes such as source IP address. For example, the same authenticated user may be allowed access from a managed device at headquarters but denied from an airport, even with the same credentials.

Zscaler documentation also shows that Zero Trust policy can go beyond simple pass or deny outcomes by applying additional controls. In DNS Security and Control, requests can be allowed, blocked, or modified. In ZIA policy development, Cloud App controls allow more granular outcomes than standard allow/block, such as restricting specific actions, applying quotas, or controlling what a user can do inside an application. This reflects the Zero Trust principle that enforcement is adaptive, granular, and tied to business and security context rather than network location alone.