Question 660
At Northgate Telecom, the network security operations team administers FortiGate-based protection for a multi-region subscriber service network under requirements for continuous secure intersite connectivity and policy traceability. An independent validation is requested for: A private subnet is reachable only through a downstream router but no destination route for the subnet exists on FortiGate. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
A controlled test reaches the specified private subnet and unrelated destinations continue to follow their existing routes. This outcome validates the intended correction for: A private subnet is reachable only through a downstream router but no destination route for the subnet exists on FortiGate. The associated approved corrective action is: Create a static route for the correct destination prefix and next-hop interface without widening the entire default route. The Northgate Telecom reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
A representative backup transfer uses the cheaper eligible link while latency-sensitive traffic follows its separate policy. This would verify a separate corrective action: Apply the supported cost-oriented SD-WAN member selection strategy with suitable link costs and business traffic classification. That separate change addresses: A cost-sensitive backup service uses an expensive link despite an available low-cost connection because the SD-WAN strategy ignores link cost. It does not validate the current Northgate Telecom issue: A private subnet is reachable only through a downstream router but no destination route for the subnet exists on FortiGate. The relevant acceptance evidence is: A controlled test reaches the specified private subnet and unrelated destinations continue to follow their existing routes.
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 Northgate Telecom issue: A private subnet is reachable only through a downstream router but no destination route for the subnet exists on FortiGate. The relevant acceptance evidence is: A controlled test reaches the specified private subnet and unrelated destinations continue to follow their existing routes.
A bounded link impairment changes the member quality status and new relevant traffic avoids the degraded path. This would verify a separate corrective action: Use an appropriate SD-WAN performance SLA with loss, latency and jitter thresholds for the defined destination. That separate change addresses: An ISP link remains physically up but its packet-loss rate exceeds the business SLA and FortiGate still reports the member as usable. It does not validate the current Northgate Telecom issue: A private subnet is reachable only through a downstream router but no destination route for the subnet exists on FortiGate. The relevant acceptance evidence is: A controlled test reaches the specified private subnet and unrelated destinations continue to follow their existing routes.