Zscaler ZSS Practice Test

ZSS practice test: what's covered

• ZIA + ZPA Troubleshooting

Free ZSS sample questions

1. A user is redirected to the IdP and authenticates successfully, but ZIA returns an 'Authentication failed' error and the SAML response shows the assertion was rejected. Which root cause should you investigate first?

   • A. The ServiceNow ticket priority was set too low for escalation
   • B. Clock skew between the IdP and Zscaler is exceeding the allowed tolerance, invalidating the SAML assertion
   • C. The user's browser cache holds an expired favicon from the previous portal
   • D. GRE tunnel keepalives to the data center are dropping intermittently
   Show answer

   Correct: B. SAML assertions carry NotBefore/NotOnOrAfter timestamps, so if the IdP and Zscaler clocks drift beyond tolerance the assertion is rejected even though sign-in succeeded. The ticket priority and favicon cache are unrelated to assertion validation, and GRE keepalives govern branch traffic forwarding, not the browser SAML exchange, so they are incorrect.

2. While troubleshooting a broken SSO login to ZIA, you need to capture and decode the exact SAML request and response exchanged in the browser. Which approach best gives you that visibility?

   • A. Run a packet capture on the GRE tunnel and read the TCP flags
   • B. Use the SAML-tracer browser extension to capture the flow, then compare audience, recipient, and NameID against the IdP configuration
   • C. Disable SSL inspection globally and retry the login once
   • D. Reboot the App Connector that fronts the authentication server
   Show answer

   Correct: B. SAML-tracer captures the base64 request/response in the browser so you can verify the audience URI, recipient endpoint, and NameID format that ZIA expects. A GRE packet capture cannot decode an encrypted browser POST, disabling SSL inspection does not affect the SAML assertion contents, and App Connectors belong to ZPA and are not in the ZIA SAML path, so those options are incorrect.

3. A branch office with 200 users and no endpoint agent needs all outbound web traffic steered to ZIA from a single edge router. Which forwarding method is the most appropriate fit for this site?

   • A. Install Zscaler Client Connector on the core switch operating system
   • B. Provision a GRE or IPsec tunnel from the branch edge router to the nearest Zscaler data center
   • C. Hardcode the ZIA gateway as the default DNS resolver only
   • D. Enable Browser Access segments for each internal application
   Show answer

   Correct: B. GRE and IPsec tunnels forward all traffic from a site to ZIA without touching endpoints, which suits a branch with no agent. Client Connector is an endpoint app and cannot run on a switch OS, pointing DNS alone does not steer web sessions through the proxy, and Browser Access is a clientless ZPA feature for internal apps, not a ZIA forwarding method, so those choices are incorrect.

4. Several users report that specific applications are reaching the internet without appearing in the ZIA Web Insights logs, suggesting traffic is bypassing the service. Which conditions could legitimately cause this bypass? (Choose THREE)

   • A. A PAC file return statement that sends matching hosts DIRECT instead of to the proxy
   • B. An application that uses certificate pinning and is on the Client Connector bypass list
   • C. IPv6 traffic egressing locally when only IPv4 is being tunneled to Zscaler
   • D. The user changing their LinkedIn profile headline during the session
   • E. A higher monthly invoice from the internet service provider
   Show answer

   Correct: A and B and C. PAC DIRECT returns, bypass-listed pinned apps, and unhandled IPv6 all let traffic leave without traversing ZIA, so none of it lands in Web Insights. A LinkedIn headline edit is user activity unrelated to forwarding, and the ISP invoice amount has no effect on whether packets reach the proxy, so those two are incorrect.

5. After enabling SSL inspection, managed laptops suddenly show certificate-not-trusted warnings on nearly every HTTPS site. What is the most likely cause to remediate first?

   • A. The Zscaler intermediate CA certificate has not been deployed to the endpoint trust stores
   • B. The corporate Wi-Fi SSID was renamed earlier that week
   • C. Users are typing the website addresses with uppercase letters
   • D. The NSS feed to the SIEM stopped streaming overnight
   Show answer

   Correct: A. SSL inspection re-signs sessions with Zscaler's intermediate CA, so without that CA in the endpoint trust store every site shows an untrusted-certificate error. Renaming an SSID does not affect certificate trust, URL letter case is normalized by browsers and is irrelevant, and an NSS streaming outage only affects log delivery, not the client trust chain, so those are incorrect.

Last updated: 2026-10-19

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