- A
The health-check server's IP does not match the application's destination IP, so SLA measurements are not representative
SLA probes measure performance to the configured server, which may not correlate with actual performance to a different destination. The administrator should configure a health-check server that represents the real application traffic.
- B
The SD-WAN rule is configured with 'set load-balance-mode' instead of 'best-quality'
Why wrong: The question states best quality strategy is used, so this is not the issue.
- C
The health-check server is not reachable from the faster link
Why wrong: SLA compliance is above 90% on both links, so both are reachable.
- D
The SD-WAN rule has a manual routing override configured
Why wrong: There is no mention of a manual override; the rule uses best quality strategy.
Quick Answer
The answer is that the health-check server's IP does not match the application's destination IP, so the SLA measurements are not representative of the actual path to the SaaS application. This is the most likely reason traffic uses the slower link despite both WAN links showing high SLA compliance. SD-WAN SLA health checks measure performance only to a specific configured server—such as a public DNS or internet IP—and the route selection logic bases its best-quality SLA decision solely on those results. If the actual application traffic goes to a different server, the measured latency and jitter do not reflect the real path performance to that destination, causing the SD-WAN rule to select a suboptimal link. On the Fortinet NSE 7 Advanced Security exam, this scenario tests your understanding that SLA health checks are destination-specific; a common trap is assuming high SLA compliance to one IP guarantees good performance to all IPs. Remember the memory tip: “Check the check—if the server IP doesn’t match, the SLA is a mismatch.”
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 is troubleshooting an SD-WAN scenario where traffic from a branch office to a critical SaaS application is experiencing high latency. The SD-WAN rule uses the best quality SLA strategy. The administrator runs 'diagnose sys sdwan neighbor' and sees that both WAN links have SLA compliance above 90%. However, traffic still uses the slower link. The administrator then runs 'diagnose sys sdwan health-check list' and notices that the health-check server IP is different from the SaaS application's server IP. What is the MOST likely reason the traffic is not using the best-performing link?
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
The health-check server's IP does not match the application's destination IP, so SLA measurements are not representative
SD-WAN SLA health checks measure performance to a specific server (e.g., a public DNS or internet IP). If the actual application traffic goes to a different server, the measured SLA may not reflect the real path performance to that destination. The route selection logic uses SLA results only for the configured health-check server.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 health-check server's IP does not match the application's destination IP, so SLA measurements are not representative
Why this is correct
SLA probes measure performance to the configured server, which may not correlate with actual performance to a different destination. The administrator should configure a health-check server that represents the real application traffic.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The SD-WAN rule is configured with 'set load-balance-mode' instead of 'best-quality'
Why it's wrong here
The question states best quality strategy is used, so this is not the issue.
- ✗
The health-check server is not reachable from the faster link
Why it's wrong here
SLA compliance is above 90% on both links, so both are reachable.
- ✗
The SD-WAN rule has a manual routing override configured
Why it's wrong here
There is no mention of a manual override; the rule uses best quality strategy.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this NSE7 question test?
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The health-check server's IP does not match the application's destination IP, so SLA measurements are not representative — SD-WAN SLA health checks measure performance to a specific server (e.g., a public DNS or internet IP). If the actual application traffic goes to a different server, the measured SLA may not reflect the real path performance to that destination. The route selection logic uses SLA results only for the configured health-check server.
What should I do if I get this NSE7 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
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?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 21, 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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