NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate is configured with two WAN interfaces in an SD-WAN zone. The administrator wants to ensure that Voice over IP (VoIP) traffic uses the link with the lowest latency, while all other traffic uses the link with the highest available bandwidth. The performance SLA 'VoIP_SLA' monitors latency to a VoIP provider. Which SD-WAN configuration should the administrator implement to meet these requirements?
⚠ Common exam trap
Many candidates confuse latency with jitter or cost, and assuming that 'lowest-cost' is equivalent to 'lowest-latency'.
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 with the 'lowest-latency' algorithm, referencing the VoIP_SLA, and apply it to VoIP traffic; create a second rule with the 'maximize-bandwidth' algorithm for all other traffic.
The correct configuration uses an SD-WAN rule with the 'lowest-latency' algorithm for VoIP traffic, which selects the WAN member with the lowest latency as measured by the performance SLA. For all other traffic, a rule with the 'maximize-bandwidth' algorithm selects the member with the highest available bandwidth. This combination satisfies both requirements.
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 an SD-WAN rule with the 'lowest-latency' algorithm, referencing the VoIP_SLA, and apply it to VoIP traffic; create a second rule with the 'lowest-cost' algorithm for all other traffic.
Why it's wrong here
The first rule correctly uses 'lowest-latency' for VoIP. However, the second rule uses 'lowest-cost' for other traffic, which selects the member with the lowest cost, not the highest bandwidth. The requirement for other traffic is highest available bandwidth, so this rule does not meet that requirement.
- ✗
Create an SD-WAN rule with the 'lowest-cost' algorithm, referencing the VoIP_SLA, and apply it to VoIP traffic; create a second rule with the 'maximize-bandwidth' algorithm for all other traffic.
Why it's wrong here
The 'lowest-cost' algorithm selects the member with the lowest cost, which is not necessarily the lowest latency. Latency is a separate metric. For VoIP, the requirement is lowest latency, so this rule would not guarantee the desired outcome. The second rule with 'maximize-bandwidth' is appropriate for other traffic, but the first rule is incorrect.
- ✓
Create an SD-WAN rule with the 'lowest-latency' algorithm, referencing the VoIP_SLA, and apply it to VoIP traffic; create a second rule with the 'maximize-bandwidth' algorithm for all other traffic.
Why this is correct
The 'lowest-latency' algorithm selects the member with the lowest latency based on the performance SLA measurements. This directly meets the VoIP requirement. The second rule with 'maximize-bandwidth' selects the link with the highest bandwidth for other traffic, which also matches the requirement.
- ✗
Create an SD-WAN rule with the 'lowest-jitter' algorithm, referencing the VoIP_SLA, and apply it to VoIP traffic; create a second rule with the 'maximize-bandwidth' algorithm for all other traffic.
Why it's wrong here
The 'lowest-jitter' algorithm selects the member with the lowest jitter, not latency. While jitter is important for VoIP, the requirement specifically states lowest latency. Therefore, this rule does not meet the stated requirement. The second rule is correct for other traffic, but the first rule is not.
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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.