An administrator configures an SD-WAN rule with a 'Lowest Cost (SLA)' strategy. What determines the metric used by FortiOS to select the best interface when multiple links meet the SLA criteria?
Trap 1: The round-robin algorithm applied sequentially across all active…
Round-robin is used for spillover or measured load balancing strategies.
Trap 2: The lowest physical port number on the FortiGate hardware
Port numbers have no bearing on SD-WAN path selection algorithms.
Trap 3: The highest interface bandwidth capacity defined in the static…
Bandwidth capacity is used for bandwidth-based strategies, not Lowest Cost (SLA).
- A
The round-robin algorithm applied sequentially across all active links
Why wrong: Round-robin is used for spillover or measured load balancing strategies.
- B
The lowest physical port number on the FortiGate hardware
Why wrong: Port numbers have no bearing on SD-WAN path selection algorithms.
- C
The lowest packet loss, jitter, or latency value measured by the health check among the qualifying links
Correct. Lowest Cost (SLA) selects the interface that has the best metric value among those meeting the SLA thresholds.
- D
The highest interface bandwidth capacity defined in the static route table
Why wrong: Bandwidth capacity is used for bandwidth-based strategies, not Lowest Cost (SLA).