Exam ZDTE Topic 1 Question 13 Discussion

In the Zscaler Digital Transformation Engineer material, DNS is highlighted as a critical dependency in the overall user experience path. When DNS responses are slow or inconsistent, even well-designed network paths and high-bandwidth links still result in poor page load times and sluggish application behavior. The Zscaler help on performance explicitly calls out that delayed DNS responses negatively affect page loading times, underscoring that DNS resolution speed directly impacts perceived performance.
Zscaler's DNS Security and Control and Trusted Resolver capabilities are designed not only to improve security but also to deliver "lightning-fast, secure DNS resolution and high availability" and to "ensure a great user experience with requests resolved at the edge." Choosing the right DNS architecture-where resolvers are close to users, highly available, and integrated with security policy-therefore becomes a primary lever to improve performance and responsiveness for all applications.
Limiting the number of DNS queries, reducing internet cost, or adding configuration complexity are not stated goals of Zscaler's recommended DNS design. Instead, the curriculum consistently frames correct DNS architecture as foundational to fast, reliable name resolution and a smooth digital experience, which aligns directly with option B.