Question 720
At Keystone BioLabs, the laboratory infrastructure team administers FortiGate-based protection for research sites with private data collection networks under requirements for sensitive workload isolation and measurable security events. An independent validation is requested for: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
A controlled impairment makes the degraded member fail the voice SLA and a new eligible voice session chooses the healthy link. This outcome validates the intended correction for: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. The associated approved corrective action is: Configure appropriate SD-WAN health checks and voice-service SLA thresholds that represent the actual service destinations. The Keystone BioLabs reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
The primary route is selected during normal service and the backup route is used after the primary becomes ineligible. This would verify a separate corrective action: Configure the intended administrative distances or priorities and verify the route selection semantics for the deployed FortiOS version. That separate change addresses: A FortiGate administrator sets identical static route distances when one WAN must be preferred and the other kept for backup. It does not validate the current Keystone BioLabs issue: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. The relevant acceptance evidence is: A controlled impairment makes the degraded member fail the voice SLA and a new eligible voice session chooses the healthy link.
The routing table installs the intended destination route and a new test flow reaches the specified remote prefix. This would verify a separate corrective action: Add or correct the supporting reachable next-hop route and verify the candidate static route resolves to a valid egress interface. That separate change addresses: A remote prefix depends on a recursively resolved gateway but the FortiGate has no valid path to resolve that gateway address. It does not validate the current Keystone BioLabs issue: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. The relevant acceptance evidence is: A controlled impairment makes the degraded member fail the voice SLA and a new eligible voice session chooses the healthy link.
A client uses the intended IPv6 next hop for external destinations while IPv4 behavior remains unchanged. This would verify a separate corrective action: Configure the appropriate IPv6 gateway and route independently and verify the required IPv6 firewall policy. That separate change addresses: A FortiGate IPv6 subnet is reachable locally but outbound traffic has no IPv6 default route even though an IPv4 default route is configured. It does not validate the current Keystone BioLabs issue: An SD-WAN rule sends latency-sensitive voice traffic through a degraded link because no performance SLA probe measures packet loss and delay. The relevant acceptance evidence is: A controlled impairment makes the degraded member fail the voice SLA and a new eligible voice session chooses the healthy link.