Question 150
Following remediation at a regional data center, engineers revisit: A source NAT rule translates a SaaS connection but the associated Security permit applies to the public translated address instead of the original inside source. Which observation would BEST prove the specific issue is resolved?
Explanation
Correct Answer
Traffic logs show the permitted original source and the correct translated egress address. This evidence directly tests the intended corrective action: Use the appropriate pre-NAT source match in Security policy and verify NAT and policy evaluation separately. It confirms the failure mechanism—Security and NAT policies evaluate different address contexts for translation-dependent flows.—has been addressed in the actual affected flow.
Incorrect Answers
Guest DNS reaches only the permitted resolvers and tests to unapproved targets are blocked. This would verify resolution of a different case: An analyst sets a Security rule to allow DNS from the entire guest VLAN to any Internet server although the design authorizes two managed resolvers. It does not show that the reported issue was fixed or that its intended action—Use the appropriate pre-NAT source match in Security policy and verify NAT and policy evaluation separately.—worked.
Only the approved administrative device and user cohort reaches the management service. This would verify resolution of a different case: A Security rule permits domain administrators from a named address range, but the address range also covers contractor kiosks. It does not show that the reported issue was fixed or that its intended action—Use the appropriate pre-NAT source match in Security policy and verify NAT and policy evaluation separately.—worked.
Only registered printer endpoints reach their print service without requiring unsupported User-ID. This would verify resolution of a different case: A policy specifies source user 'known-user' for a printer fleet whose devices cannot authenticate individually, causing print delivery failures. It does not show that the reported issue was fixed or that its intended action—Use the appropriate pre-NAT source match in Security policy and verify NAT and policy evaluation separately.—worked.