NSE7 Advanced Networking and SD-WAN Practice Question
A network administrator is configuring SD-WAN on a FortiGate and wants to ensure that VoIP traffic uses the link with the lowest latency while bulk download traffic uses the link with the highest bandwidth. Which TWO configuration steps are required?
⚠ Common exam trap
NSE7 often tests the misconception that BFD or static routes alone can steer traffic by quality; candidates must remember that SD-WAN rules require a performance SLA to make quality-based decisions.
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
✓
Create an SD-WAN rule for VoIP traffic with 'best quality' strategy
Option B is correct because an SD-WAN rule with the 'best quality' strategy selects the member link that best satisfies the configured performance SLA (lowest latency, jitter, and packet loss), which is exactly what VoIP traffic requires. Option E is correct because the 'best quality' strategy depends on a performance SLA that defines the latency threshold and probes (e.g., ping, HTTP, or twamp) used to measure each member's link quality; without a latency SLA, the SD-WAN rule cannot evaluate link quality. Option A is incorrect because a static route for the VoIP subnet does not perform dynamic link selection based on latency and would bypass SD-WAN path selection. Option C is incorrect because BFD is a failure-detection mechanism for fast link-down detection, not a latency-based path selection method. Option D is incorrect because route maps are used for route filtering and attribute manipulation in routing protocols, not for SD-WAN quality-based steering.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assign a static route for the VoIP subnet
Why it's wrong here
A static route pins VoIP to a fixed next hop and cannot react to changing link latency. SD-WAN rules with measured SLA targets select the lowest-latency link dynamically; static routes suit deterministic paths where performance metrics are irrelevant.
- ✓
Create an SD-WAN rule for VoIP traffic with 'best quality' strategy
Why this is correct
The 'best quality' strategy selects the member with the lowest measured latency, directly satisfying the VoIP requirement. It relies on an associated performance SLA to supply those latency values, so pairing it with a latency SLA makes VoIP follow the fastest link.
- ✗
Enable BFD on all WAN interfaces
Why it's wrong here
BFD is for fast failure detection, not traffic steering.
- ✗
Configure a route map for VoIP traffic
Why it's wrong here
Route maps influence route redistribution and path selection in the routing table; they do not classify traffic into SD-WAN rules by latency or bandwidth. It is tempting because route maps genuinely steer traffic, but SD-WAN SLA-based steering uses SD-WAN rules with performance SLAs instead.
- ✓
Create a performance SLA for latency
Why this is correct
A performance SLA defines the probe type and thresholds used to measure latency per member. Without it, 'best quality' has no latency data to compare, so the VoIP rule cannot identify the lowest-latency link. It supplies the metric the strategy consumes.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Fortinet exam blueprint
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.