Question 120
A network and security operations handoff reports: An administrator allows access to a cloud application by one current IP address and the service later migrates to a different content delivery network node. Which technical principle most directly explains this behavior?
Explanation
Correct Answer
The underlying principle is: Static destination IP permissions can become stale for distributed SaaS services whose resolved addresses change regularly. Address it by: Use a supported application or destination classification that matches the approved service without opening an entire hosting network. The confirmation is: The approved app remains reachable after an authorized endpoint change while unrelated cloud destinations remain restricted.
Incorrect Answers
Firewall matching depends on protocol as well as destination port; blocking only one transport does not cover every DNS flow. “Define a policy that addresses the intended TCP and UDP DNS traffic while preserving approved resolver access” would remedy that alternative situation, but it would not correct the present issue: static destination IP permissions can become stale for distributed SaaS services whose resolved addresses change regularly.
“Review the matched IPS rule and configure the appropriate supported block action under the approved risk policy” is the supported response when detection and blocking are distinct IPS actions, so a signature match is not proof that inline traffic was prevented. Here the decisive response is “Use a supported application or destination classification that matches the approved service without opening an entire hosting network”, so that different intervention does not meet the stated requirement.
A detection list without a corresponding effective threat policy action provides visibility but not the desired prevention. “Add the verified malicious domain or indicator to the appropriate threat-protection block control and test the rule precedence” applies to that other condition. The reported evidence is an administrator allows access to a cloud application by one current IP address and the service later migrates to a different content delivery network node; this alternative would address the wrong dependency.