NSE7 Troubleshooting and Diagnostics Practice Question
An administrator is configuring SD-WAN and wants to ensure that voice traffic uses the lowest latency link. Which two configurations are required to achieve this? (Choose TWO.)
⚠ Common exam trap
Watch out — candidates often confuse 'manual' strategy with 'best quality', assuming manual allows manual selection of the best link, but manual actually forces a fixed interface without dynamic SLA feedback.
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 with latency threshold
A performance SLA with a latency threshold allows FortiGate to measure real-time latency to a target server and mark the link quality. Option D is correct because an SD-WAN rule using the 'best quality' strategy will dynamically select the link with the lowest latency (as determined by the SLA) for voice traffic, ensuring optimal voice quality.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a static route for the voice subnet
Why it's wrong here
A static route pins the voice subnet to one next hop regardless of measured latency, so it cannot dynamically prefer the lowest-latency member. Static routing is tempting because it does control path selection, but it would be correct where deterministic fixed forwarding matters rather than performance-based SD-WAN steering.
- ✓
Configure a performance SLA with latency threshold
Why this is correct
A performance SLA with a latency threshold continuously probes each member link, measuring jitter and packet loss against the configured latency limit. SD-WAN then steers voice traffic onto the link satisfying that threshold, directly meeting the requirement for lowest-latency path selection.
- ✗
Set the SD-WAN rule to use 'manual' strategy
Why it's wrong here
The manual strategy requires an administrator to name the preferred member explicitly, so it cannot react to changing latency measurements. Manual is tempting because it gives direct control over link choice, but it would be correct when policy must override dynamic selection, not when latency decides.
- ✓
Create an SD-WAN rule that matches voice traffic and uses 'best quality' strategy
Why this is correct
An SD-WAN rule matching voice traffic with the 'best quality' strategy continuously measures link performance—latency, jitter and packet loss—then steers traffic onto the link with the lowest measured latency. This directly satisfies the stem's requirement that voice traffic use the lowest latency link.
- ✗
Enable NAT on the SD-WAN interface
Why it's wrong here
NAT rewrites addresses and ports; it does not measure or compare link latency, so it cannot influence which member SD-WAN selects. NAT is tempting because it is configured on SD-WAN interfaces, but it would be correct only when the requirement is address translation for outbound traffic, not latency-based steering.
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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.