Question 950
At Lakeview Insurance, the FortiGate 7.6 security administration team encounters the following authorized operational case: the WAN interface is administratively shut down but staff still depend on a route formerly tied to it. They need a defensible FortiOS configuration, diagnosis, validation or prevention decision. What root condition most directly explains the described FortiGate symptom?
Explanation
Correct Answer
An unavailable outgoing interface can render its associated route inactive or unusable. The mechanism is relevant because the stated route table after interface failure incident concerns the actual selected path, policy, identity or inspection state. The appropriate response is to restore the approved interface or provide an alternate supported active route; verify it through this observed condition: an operational egress route appears after recovery and an authorized flow completes.
Incorrect Answers
Variation in packet delay can degrade interactive media even when mean latency remains low explains a different situation, sla jitter for conferencing, where video meetings stutter over a WAN whose average latency is acceptable but jitter is high. It does not account for the specific observed route table after interface failure condition at Lakeview Insurance. The decisive mechanism here is: An unavailable outgoing interface can render its associated route inactive or unusable.
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 route table after interface failure condition at Lakeview Insurance. The decisive mechanism here is: An unavailable outgoing interface can render its associated route inactive or unusable.
A wrong next-hop configuration can prevent SLA probes or selected flows from leaving the member explains a different situation, sd-wan member gateway mismatch, where a newly added broadband member is marked unavailable because its SD-WAN gateway IP points to a former router. It does not account for the specific observed route table after interface failure condition at Lakeview Insurance. The decisive mechanism here is: An unavailable outgoing interface can render its associated route inactive or unusable.