- A
Increase the priority of Link A to ensure it remains the preferred link.
Why wrong: Increasing priority would not address the performance degradation; it would keep traffic on Link A despite poor quality.
- B
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.
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.
- C
Disable link-quality-measurement to reduce overhead on Link A.
Why wrong: Disabling link-quality-measurement would remove the ability to monitor performance, not improve it.
- D
Add a new SD-WAN rule with 'lowest cost' strategy for VoIP traffic.
Why wrong: Lowest cost strategy does not consider quality; it would not improve voice quality.
Quick Answer
The answer is to configure a performance SLA for VoIP traffic with specific thresholds for jitter, latency, and packet loss, then apply it to the SD-WAN rule. This is correct because the 'best quality' strategy with link-quality-measurement selects the link with the highest SLA compliance; by defining a packet-loss threshold below 0.5%, FortiGate will dynamically failover VoIP traffic to a healthier WAN link when Link A’s packet loss becomes elevated, even if jitter and latency remain acceptable. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding of how performance SLAs drive automatic failover in SD-WAN, a common trap being that administrators focus only on jitter and latency while overlooking packet loss as the primary culprit for poor voice quality. A useful memory tip is “PLoS triggers failover” — packet loss, not just jitter or latency, is the critical metric for VoIP quality in SD-WAN performance SLA configurations.
NSE7 Advanced Networking and SD-WAN Practice Question
This NSE7 practice question tests your understanding of advanced networking and sd-wan. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
Option B is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Detailed technical explanation
How to think about this question
FortiGate's SD-WAN 'best quality' strategy uses link-quality-measurement to periodically probe each link with performance SLA probes (e.g., ICMP or UDP jitter) and compares results against configured thresholds. When a link fails the SLA (e.g., packet loss > 0.5%), it is marked as 'dead' or degraded, and traffic is moved to the next best link based on the strategy's ordering (e.g., lowest jitter or latency). In real-world scenarios, packet loss as low as 1% can cause noticeable VoIP degradation (e.g., codec G.711 requires <1% loss for toll-quality), so setting a strict packet-loss threshold ensures automatic failover before users perceive issues.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the NSE7 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this NSE7 question test?
Advanced Networking and SD-WAN — This question tests Advanced Networking and SD-WAN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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. — Option B is correct because 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.
What should I do if I get this NSE7 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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