NSE7 Advanced Networking and SD-WAN Practice Question
An administrator is configuring SD-WAN on a FortiGate to route traffic between two internet connections (ISP1 and ISP2). The SD-WAN rules use performance SLA to measure latency. Which TWO statements are true about SD-WAN rule matching and failover?
⚠ Common exam trap
Test-takers frequently assume 'best quality' or 'lowest cost' actions will drop traffic when no member meets the SLA, but FortiGate always forwards traffic using the best available member to avoid connectivity loss.
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
✓
When the SD-WAN rule action is set to 'best quality' and no member meets the SLA, the FortiGate will still forward traffic using the member with the best SLA status.
When an SD-WAN rule is configured with 'best quality' strategy, the FortiGate selects the member with the best SLA status even if no member fully meets the SLA threshold. This ensures traffic is still forwarded using the least-bad option rather than being dropped, maintaining connectivity under degraded conditions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
When the SD-WAN rule action is set to 'best quality' and no member meets the SLA, the FortiGate will still forward traffic using the member with the best SLA status.
Why this is correct
Correct. If no member meets the SLA, the FortiGate uses the member with the best SLA status (least bad) to forward traffic.
- ✓
SD-WAN rules can use multiple members and the best member is selected based on performance SLA measurements.
Why this is correct
Correct. SD-WAN rules can have multiple members and the best member is chosen based on the configured strategy (e.g., best quality, lowest cost) and SLA status.
- ✗
SD-WAN automatically fails over all sessions to the backup member if the primary member exceeds the SLA threshold.
Why it's wrong here
Incorrect. SD-WAN failover affects only new sessions; existing sessions are not automatically moved unless the session is part of a persistent session or a static route is used.
- ✗
If multiple SD-WAN rules match, the rule with the highest bandwidth member is used.
Why it's wrong here
Incorrect. SD-WAN rules are evaluated in order; the first matching rule is used, not the one with highest bandwidth.
- ✗
When the SD-WAN rule action is set to 'lowest cost' and no member meets the SLA, the FortiGate drops the traffic.
Why it's wrong here
Incorrect. With 'lowest cost' and no SLA met, the FortiGate still forwards traffic using the member with the lowest cost, but it logs a warning.
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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.