NSE7 Advanced Networking and SD-WAN Practice Question
An enterprise uses FortiGate as an SD-WAN edge device with three WAN links: Link A (MPLS), Link B (broadband), and Link C (LTE). The SD-WAN rule for VoIP traffic uses the 'best quality' strategy with link-quality-measurement enabled. The VoIP traffic is routed via Link A. During peak hours, users report poor voice quality. The administrator checks the SD-WAN performance SLA logs and sees that Link A's jitter and latency are within acceptable thresholds, but packet loss is slightly elevated. Which action would most likely improve VoIP quality without manual intervention?
⚠ Common exam trap
It's easy for candidates to assume 'best quality' automatically handles all quality metrics, but without a performance SLA with explicit thresholds, FortiGate only uses link-quality-measurement for ordering and does not failover based on packet loss alone.
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 VoIP traffic with jitter < 10ms, latency < 100ms, and packet-loss < 0.5% and apply it to the SD-WAN rule.
Configuring a performance SLA with specific thresholds for jitter, latency, and packet loss allows FortiGate to dynamically failover VoIP traffic to another WAN link when Link A's packet loss exceeds the defined threshold (e.g., 0.5%). Since the 'best quality' strategy uses link-quality-measurement to select the link with the best SLA compliance, applying a performance SLA with a packet-loss threshold ensures that even if jitter and latency are acceptable, elevated packet loss triggers a switch to a healthier link, improving voice quality without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the priority of Link A to ensure it remains the preferred link.
Why it's wrong here
Increasing priority would not address the performance degradation; it would keep traffic on Link A despite poor quality.
- ✓
Configure a performance SLA for VoIP traffic with jitter < 10ms, latency < 100ms, and packet-loss < 0.5% and apply it to the SD-WAN rule.
Why this is correct
Applying a performance SLA with strict thresholds will cause the SD-WAN rule to select a link that meets the criteria, switching away from Link A if it fails the SLA.
- ✗
Disable link-quality-measurement to reduce overhead on Link A.
Why it's wrong here
Disabling link-quality-measurement would remove the ability to monitor performance, not improve it.
- ✗
Add a new SD-WAN rule with 'lowest cost' strategy for VoIP traffic.
Why it's wrong here
Lowest cost strategy does not consider quality; it would not improve voice quality.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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