Question 1030
At Merriton Insurance, the FortiGate 7.6 security administration team encounters the following authorized operational case: users report intermittent slow internet but operations inspects only the current green member state. They need a defensible FortiOS configuration, diagnosis, validation or prevention decision. What root condition most directly explains the described FortiGate symptom?
Explanation
Correct Answer
A present healthy status does not exclude earlier performance deterioration. The mechanism is relevant because the stated sd-wan diagnostic sla history incident concerns the actual selected path, policy, identity or inspection state. The appropriate response is to review historical SD-WAN SLA latency, jitter and loss events for the affected period; verify it through this observed condition: the archived SLA evidence correlates with a reproduced quality incident.
Incorrect Answers
A route entry does not guarantee layer-two adjacency to its gateway explains a different situation, next-hop arp resolution, where a valid static route remains installed but traffic fails because the upstream next-hop IP is not on the reachable VLAN. It does not account for the specific observed sd-wan diagnostic sla history condition at Merriton Insurance. The decisive mechanism here is: A present healthy status does not exclude earlier performance deterioration.
An up physical interface is not automatically eligible for SD-WAN service selection explains a different situation, sd-wan member underlay onboarding, where a new secondary ISP circuit comes online but FortiGate SD-WAN never sends traffic through it because the physical interface is not configured as a member. It does not account for the specific observed sd-wan diagnostic sla history condition at Merriton Insurance. The decisive mechanism here is: A present healthy status does not exclude earlier performance deterioration.
Service selection can match more than one subnet when broad source objects are used explains a different situation, sd-wan source network matching, where a guest VLAN follows the corporate MPLS WAN rule because its SD-WAN source condition was configured too broadly. It does not account for the specific observed sd-wan diagnostic sla history condition at Merriton Insurance. The decisive mechanism here is: A present healthy status does not exclude earlier performance deterioration.