For rapid root-cause isolation, ZDX Analyze Score with the Y-Engine is the right diagnostic path. It correlates endpoint, network, Zscaler path, and application metrics so the administrator does not have to manually interpret packet captures or guess whether AWS, Wi-Fi, ISP, or device health is responsible. Option B (Check the user ' s ZDX score for a period of low score for AWS and use Analyze Score to get the ZDX Y-Engine analysis) is correct because it gives the fastest useful root-cause analysis from the user ' s ZDX score.

Why the other options are incorrect:

A. Check the Zscaler Trust page for any indications of cloud outages or incidents that would be causing a slowdown: The Zscaler Trust page reports cloud service incidents, but it will not isolate one user’s endpoint, Wi-Fi, ISP, or AWS path issue.

C. Do a Deep Trace on the user ' s traffic and check for excessive DNS resolution times and other slowdowns: DNS resolves names to IP addresses; it is a support service, not an access protocol or scoring engine by itself.

D. Initiate a packet capture from Zscaler Client Connector and escalate the case to have the trace analyzed for root cause: Zscaler Client Connector is the endpoint agent that steers traffic, authenticates users, reports posture, and supplies ZDX telemetry.