The answer is that new sessions will use the Internet link while existing sessions continue on the MPLS link. This occurs because FortiGate’s Best Quality strategy for SD-WAN continuously monitors performance SLA metrics like latency; when the MPLS link’s latency spikes to 60 ms—worse than the Internet link’s 40 ms—the SD-WAN rule steers new sessions to the best available member based on the lowest latency value. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding of how Best Quality differs from other strategies, particularly that it does not preemptively fail over existing flows, only new ones. A common trap is assuming all traffic switches immediately, but FortiGate preserves session stickiness for established connections. Remember the mnemonic: “New flows follow the best metric; old flows finish their ticket.”
NSE7 Advanced Networking and SD-WAN Practice Question
This NSE7 practice question tests your understanding of advanced networking and sd-wan. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A FortiGate with SD-WAN enabled uses two members: MPLS (10 ms latency) and Internet (40 ms latency). The SD-WAN rule uses 'Best Quality' strategy with latency as the metric. Traffic to a critical application (10.1.1.0/24) is currently using the MPLS link. The MPLS link's latency increases to 60 ms due to a routing issue. How will FortiGate handle new sessions to 10.1.1.0/24?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
New sessions will use the Internet link; existing sessions continue on MPLS.
With 'Best Quality' strategy, FortiGate continuously monitors performance SLAs. When the MPLS link's latency exceeds the threshold or becomes worse than the Internet link, new sessions will be steered to the best available member (Internet) based on the metric. Existing sessions remain on the original link until they expire.
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.
✓
New sessions will use the Internet link; existing sessions continue on MPLS.
Why this is correct
Best Quality uses SLA metrics to steer new sessions to the best member, but does not affect existing sessions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
FortiGate will wait for the MPLS link to recover before sending new traffic.
Why it's wrong here
FortiGate will not wait; it will use the Internet link as it becomes the best.
✗
All sessions immediately switch to the Internet link.
Why it's wrong here
Only new sessions are affected; existing sessions are not disrupted.
✗
Existing sessions continue on MPLS; new sessions will use MPLS until the next SLA probe.
Why it's wrong here
The SLA probe would detect the high latency and steer new sessions away.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: New sessions will use the Internet link; existing sessions continue on MPLS. — With 'Best Quality' strategy, FortiGate continuously monitors performance SLAs. When the MPLS link's latency exceeds the threshold or becomes worse than the Internet link, new sessions will be steered to the best available member (Internet) based on the metric. Existing sessions remain on the original link until they expire.
What should I do if I get this NSE7 question wrong?
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". 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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