Question 690
At Harborline Logistics, the WAN and firewall administration team administers FortiGate-based protection for a multi-depot shipment tracking network under requirements for verified route health and appropriate egress restrictions. An independent validation is requested for: FortiGate drops packets from a multihomed client because reverse path validation sees the source through another interface. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
A legitimate multihomed test path is accepted and obviously spoofed-source traffic remains denied under the approved policy. This outcome validates the intended correction for: FortiGate drops packets from a multihomed client because reverse path validation sees the source through another interface. The associated approved corrective action is: Analyze reverse path forwarding expectations and correct asymmetric routing or supported RPF configuration without disabling security globally. The Harborline Logistics reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
A controlled impairment makes the degraded member fail the voice SLA and a new eligible voice session chooses the healthy link. This would verify a separate corrective action: Configure appropriate SD-WAN health checks and voice-service SLA thresholds that represent the actual service destinations. That separate change addresses: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. It does not validate the current Harborline Logistics issue: FortiGate drops packets from a multihomed client because reverse path validation sees the source through another interface. The relevant acceptance evidence is: A legitimate multihomed test path is accepted and obviously spoofed-source traffic remains denied under the approved policy.
New authorized sessions follow the SD-WAN route and the routing table no longer bypasses the intended zone. This would verify a separate corrective action: Align static default routing and eligible SD-WAN members with the documented FortiOS forwarding behavior. That separate change addresses: An SD-WAN rule has healthy members but traffic uses an old default route outside the SD-WAN architecture. It does not validate the current Harborline Logistics issue: FortiGate drops packets from a multihomed client because reverse path validation sees the source through another interface. The relevant acceptance evidence is: A legitimate multihomed test path is accepted and obviously spoofed-source traffic remains denied under the approved policy.
A controlled brief quality fluctuation does not cause unnecessary repeated WAN switches while sustained failure still triggers rerouting. This would verify a separate corrective action: Tune supported SD-WAN health-check thresholds, recovery timing and member-selection preference based on measured stability. That separate change addresses: A recovered backup WAN link immediately attracts all new sessions and causes route oscillation because link recovery thresholds are too sensitive. It does not validate the current Harborline Logistics issue: FortiGate drops packets from a multihomed client because reverse path validation sees the source through another interface. The relevant acceptance evidence is: A legitimate multihomed test path is accepted and obviously spoofed-source traffic remains denied under the approved policy.