Authentic Zscaler Certification Exam ZDTE Questions Answers

Within the ZIA Cloud Firewall and broader Zscaler Internet Access architecture, Public Service Edges (PSEs) are the core policy enforcement points. User traffic is steered (via tunnels, PAC files, or agents) to the nearest PSE, where Zscaler performs security inspection and policy evaluation. At this point, the Cloud Firewall, URL filtering, SSL inspection, IPS, sandboxing, and other security engines are applied according to the user’s identity, group, location, and defined policies.

Although the PSEs naturally participate in traffic distribution across the global Zscaler cloud, their primary purpose is not generic load balancing or network transit; rather, they host the full security stack and make real-time allow/deny/log decisions. They also enforce bandwidth controls, application rules, and advanced threat protections before forwarding allowed traffic to the internet.

They are not responsible for managing endpoint security updates or providing general cloud storage. Instead, they serve as inline security gateways that enforce Zero Trust access and granular firewall rules at scale. Therefore, the correct description of their role in the Cloud Firewall architecture is that they act as key policy enforcement engines.

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The Zscaler OneAPI framework is presented in the Engineer curriculum as the unified automation layer for ZIA, ZPA, ZDX, Client Connector, and other services. For ZIA specifically, OneAPI introduces OAuth-based authentication, fine-grained administrator role-based access control for API clients, configuration and policy management endpoints, activation controls, and access to Insights and log retrieval APIs. The course material highlights examples such as using OneAPI to manage admin roles, automate malware and advanced-threat settings, and programmatically retrieve Web Insights logs for reporting and SIEM workflows.

In contrast, SCIM (System for Cross-domain Identity Management) is described separately as an identity-provisioning standard used to synchronize users and groups from identity providers like Azure AD or Okta. Enabling or disabling SCIM and configuring SCIM endpoints is handled through dedicated SCIM configuration, not through the OneAPI framework. While both OneAPI and SCIM are automation-related, they are distinct interfaces in the Zscaler platform. Therefore, among the options provided, SCIM Enable/Disable is the capability that is not part of the OneAPI Framework for ZIA, whereas administrator RBAC, Web Insights log retrieval, and malware policy settings are all explicitly included.

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Zscaler OneAPI provides a unified, programmatic interface to automate configuration and operations across the Zscaler platform, including ZIA, ZPA, and Zscaler Client Connector. Zscaler’s OneAPI documentation clearly states that OneAPI uses the OAuth 2.0 authorization framework to secure access to these APIs.

In practice, administrators or automation platforms register an API client in ZIdentity, obtain OAuth 2.0 access tokens, and then use those tokens to call OneAPI endpoints. The use of OAuth 2.0 ensures standardized flows for client authentication, token issuance, and scope-based authorization, aligning with modern security best practices and making it easier to control and audit API access. Zscaler also highlights OAuth 2.0 as one of the three architectural pillars of OneAPI, along with a common endpoint and tight integration with ZIdentity.

While JSON Web Tokens (JWTs) can be used as a token format inside OAuth 2.0, they are not, by themselves, the authorization framework. SAML is typically used for browser-based SSO, not for securing REST APIs in this context. API Keys are simpler credential schemes and are not what Zscaler prescribes for OneAPI. As a result, OAuth 2.0 is the correct and exam-relevant answer.

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