The answer is that the SD-WAN rule’s ‘set strategy’ is ‘manual’ and the preferred member remains set to the primary interface. This is the most likely reason SD-WAN failover is not occurring because a manual strategy does not automatically reroute traffic when a link goes down; it only uses the configured preferred member, regardless of its health status. Even with correct SLA targets and a ‘dead’ interface health check, the rule will stubbornly keep sending traffic to the dead primary link until an administrator manually changes the preferred member or an automation script intervenes. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your understanding of SD-WAN rule strategies and the critical distinction between automatic and manual failover behavior—a common trap is assuming that a dead health check alone triggers failover under manual strategy. Remember the memory tip: “Manual means you move the lever; automatic means the engine does it.”
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. 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.
An administrator notices that SD-WAN rule-based traffic is not failing over as expected when the primary link goes down. The SLA targets are configured correctly, and the interface health check is showing 'dead' for the primary link. What is the MOST likely reason for the failover not occurring?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SD-WAN rule's 'set strategy' is 'manual' and the preferred member is still set to the primary interface
Option C is correct. Manual strategy does not automatically failover; the preferred member must be changed manually or via automation.
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.
✓
The SD-WAN rule's 'set strategy' is 'manual' and the preferred member is still set to the primary interface
Why this is correct
When strategy is 'manual', the rule will not failover automatically; traffic continues to be sent to the preferred member even if the SLA is dead.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The SD-WAN rule's 'set status' is set to 'disable'
Why it's wrong here
Disabled rules would not match traffic, but failover would still occur for enabled rules.
✗
The secondary interface has a higher cost than the primary interface
Why it's wrong here
Cost does not affect SD-WAN rule failover; it affects routing table selection.
✗
The 'set update-static-route' is not enabled on the SD-WAN
Why it's wrong here
This setting updates routing tables but is not required for SD-WAN rule failover.
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.
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SD-WAN rule's 'set strategy' is 'manual' and the preferred member is still set to the primary interface — Option C is correct. Manual strategy does not automatically failover; the preferred member must be changed manually or via automation.
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: "most likely", "primary". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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