Question 290
An expired certificate causes periodic VPN tunnel failure at reauthentication, but operators attempt to fix it only by adding broad firewall permit rules. Which observable result BEST demonstrates that the intended FortiGate security or connectivity requirement is satisfied?
Explanation
Correct Answer
Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. This is the operational validation outcome rather than merely an enabled setting. Disabling certificate or peer identity verification may bring a tunnel up but defeats authentication, and scheduled IKE/ESP rekey depends on both ends agreeing on proposals. Scenario: An expired certificate causes periodic VPN tunnel failure at reauthentication, but operators attempt to fix it only by adding broad firewall permit rules.
Incorrect Answers
When one tunnel or underlay fails, protected applications reconnect through a valid alternative within the documented recovery target. This result would test Redundant tunnels, dead peer detection and controlled failover but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An expired certificate causes periodic VPN tunnel failure at reauthentication, but operators attempt to fix it only by adding broad firewall permit rules.
Private application sessions traverse an eligible encrypted overlay with tested failover and stable return routing across the WAN links. This result would test SD-WAN IPsec overlay routing and tunnel path choice but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An expired certificate causes periodic VPN tunnel failure at reauthentication, but operators attempt to fix it only by adding broad firewall permit rules.
Each approved session carries the correct user/group identity to the intended policy and stale or unattributed source addresses do not receive privileged access. This result would test Active versus passive FortiGate authentication evidence but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An expired certificate causes periodic VPN tunnel failure at reauthentication, but operators attempt to fix it only by adding broad firewall permit rules.