NSE7 Advanced Networking and SD-WAN Practice Question
A network engineer is configuring SD-WAN on a FortiGate. They have three WAN interfaces (wan1, wan2, lte) and want traffic to the primary datacenter (10.10.10.0/24) to use wan1 unless its latency exceeds 50 ms, in which case failover to wan2. The engineer created an SD-WAN rule with a strategy of 'Manual' and selected 'wan1' as the preferred member. What additional configuration is required to achieve automatic failover based on latency?
⚠ Common exam trap
Test-takers frequently confuse BFD (which detects link failures) with Performance SLA (which measures latency and triggers failover based on quality thresholds), leading them to choose Option C instead of D.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a performance SLA for wan1 with a latency threshold of 50 ms and associate it with the SD-WAN rule.
SD-WAN automatic failover based on latency requires a Performance SLA (performance-sla) configured with a latency threshold of 50 ms, and that SLA must be associated with the SD-WAN rule. The rule's strategy should be set to 'Manual' with wan1 as preferred member, but the SLA triggers the failover when the latency exceeds the threshold, causing the rule to select the next available member (wan2). Without the SLA, the Manual strategy simply pins traffic to wan1 and never fails over.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a route map to prefer wan1 and apply it to the SD-WAN rule.
Why it's wrong here
Route maps are for routing policy, not for SD-WAN failover based on SLA metrics.
- ✗
Set the SD-WAN rule strategy to 'Best Quality' and select latency as the metric.
Why it's wrong here
Best Quality strategy would automatically select the best member based on SLA metrics, but the engineer wants a manual preference with SLA-based failover.
- ✗
Enable BFD on wan1 and wan2 with a minimum interval of 50 ms.
Why it's wrong here
BFD detects link failures but does not measure latency; it is used for fast convergence, not for SLA-based failover.
- ✓
Configure a performance SLA for wan1 with a latency threshold of 50 ms and associate it with the SD-WAN rule.
Why this is correct
The performance SLA measures latency and triggers failover when the threshold is exceeded.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.