The answer is that the real server is not reachable or is down. This is correct because the fnbam debug output clearly shows the load balancer selected a server, as indicated by the 'LB_SELECTED: selected server 10.0.0.2:80' message, yet the client connection subsequently fails. In FortiGate server load balancing, the fnbam (FortiGate Network-Based Application Management) process handles server selection, but a successful selection does not guarantee the server is actually responsive; the failure points to a connectivity or health check issue with the chosen real server. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your ability to interpret debug logs and distinguish between a successful load-balancing decision and a failed backend connection—a common trap where candidates assume selection equals success. Remember the key distinction: selection is not connection. A useful memory tip is "Selected does not mean connected," so always verify the real server's health and reachability when the debug shows a selection but the client fails.
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 runs 'diagnose debug application fnbam -1' and sees messages like 'LB_SELECT: selected server 10.0.0.2:80' but the client connection fails. The FortiGate is configured with server load balancing. What could be the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The real server is not reachable or is down
The debug shows the load balancer selected a server, but the connection fails. This indicates the server is not responding or the health check is failing. The administrator should check the server's health and ensure the real server is up.
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 real server is not reachable or is down
Why this is correct
Correct. The debug shows selection, but the server may not be listening or reachable.
Related concept
Read the scenario before looking for a memorised answer.
✗
The load balancing algorithm is set to least-connection
Why it's wrong here
The algorithm selection is shown; it does not cause failure.
✗
The persistence setting is misconfigured
Why it's wrong here
Persistence affects which server is chosen, not connection success.
✗
The virtual server IP is overlapping with a physical interface
Why it's wrong here
Overlap would cause address conflict, not server selection failure.
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.
Trap categories for this question
Command / output trap
The algorithm selection is shown; it does not cause failure.
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 real server is not reachable or is down — The debug shows the load balancer selected a server, but the connection fails. This indicates the server is not responding or the health check is failing. The administrator should check the server's health and ensure the real server is up.
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.
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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