Question 380
During a controlled ZIA, ZPA, or ZDX administration check, engineers discover: Threat intelligence identifies an active command-and-control domain, but requests from affected devices are only logged rather than denied. Which configuration or architecture dependency accounts for the failure?
Explanation
Correct Answer
The underlying principle is: A detection list without a corresponding effective threat policy action provides visibility but not the desired prevention. Address it by: Add the verified malicious domain or indicator to the appropriate threat-protection block control and test the rule precedence. The confirmation is: A controlled request to the designated malicious test destination is blocked while unrelated benign DNS and web services continue.
Incorrect Answers
File-type control acts on object classification and selected user groups, so a blanket block may not reflect an approved role-based exception. “Create a scoped rule for the documented signed installer source and group without removing the default risky executable restriction” would remedy that alternative situation, but it would not correct the present issue: a detection list without a corresponding effective threat policy action provides visibility but not the desired prevention.
“Define a policy that addresses the intended TCP and UDP DNS traffic while preserving approved resolver access” is the supported response when firewall matching depends on protocol as well as destination port; blocking only one transport does not cover every DNS flow. Here the decisive response is “Add the verified malicious domain or indicator to the appropriate threat-protection block control and test the rule precedence”, so that different intervention does not meet the stated requirement.
Detection and blocking are distinct IPS actions, so a signature match is not proof that inline traffic was prevented. “Review the matched IPS rule and configure the appropriate supported block action under the approved risk policy” applies to that other condition. The reported evidence is threat intelligence identifies an active command-and-control domain, but requests from affected devices are only logged rather than denied; this alternative would address the wrong dependency.