Question 710
At Bluehaven Transit, the operations firewall team administers FortiGate-based protection for rail operations support and scheduling applications under requirements for safe change windows and precise branch access. The security reviewer verifies a claimed fix for: A network technician tests fallback by disabling one FortiGate WAN port but neglects to check existing session entries that may retain the previous path. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
A new client connection follows the backup route and the report distinguishes it from preexisting sessions with cached forwarding state. This outcome validates the intended correction for: A network technician tests fallback by disabling one FortiGate WAN port but neglects to check existing session entries that may retain the previous path. The associated approved corrective action is: Evaluate a clean new session and supported session handling in addition to route table changes during the failover test. The Bluehaven Transit reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
A controlled application test produces attributable steering and link-quality data rather than relying solely on the configured rule text. This would verify a separate corrective action: Enable suitable SD-WAN event logging and monitor rule matches, member health and performance SLA outcomes during representative traffic. That separate change addresses: Network staff claim an SD-WAN rule improves application service but never check the link-health or service matching telemetry for its test sessions. It does not validate the current Bluehaven Transit issue: A network technician tests fallback by disabling one FortiGate WAN port but neglects to check existing session entries that may retain the previous path. The relevant acceptance evidence is: A new client connection follows the backup route and the report distinguishes it from preexisting sessions with cached forwarding state.
A controlled flow shows both the correct firewall allow policy and the intended SD-WAN member selection in diagnostic output. This would verify a separate corrective action: Inspect the SD-WAN service rule match, member health and routing decision independently of the forward security policy. That separate change addresses: FortiGate logs show an internet flow matched a permissive forward policy but the engineer cannot explain its SD-WAN link choice. It does not validate the current Bluehaven Transit issue: A network technician tests fallback by disabling one FortiGate WAN port but neglects to check existing session entries that may retain the previous path. The relevant acceptance evidence is: A new client connection follows the backup route and the report distinguishes it from preexisting sessions with cached forwarding state.
The office test subnet reaches approved internet services through the SD-WAN zone without broadening the existing source policy. This would verify a separate corrective action: Update the relevant firewall policy interface mapping to the supported SD-WAN zone and preserve address and service restrictions. That separate change addresses: Users are allowed by firewall policy but lose WAN connectivity after interfaces are moved into an SD-WAN zone while the old policy still references physical ports. It does not validate the current Bluehaven Transit issue: A network technician tests fallback by disabling one FortiGate WAN port but neglects to check existing session entries that may retain the previous path. The relevant acceptance evidence is: A new client connection follows the backup route and the report distinguishes it from preexisting sessions with cached forwarding state.