- A
The IPS sensor is configured in 'passive' mode, which suppresses anomaly detection.
Why wrong: Passive mode still detects anomalies; it just doesn't block them.
- B
The anomaly signatures have not triggered any events yet because traffic thresholds have not been exceeded.
Anomaly detection is rate-based; signatures only appear when the configured threshold is exceeded. If no traffic has triggered them, the list will be empty.
- C
Anomaly signatures are not displayed by 'diagnose ips anomaly list'; they require a different command.
Why wrong: The command should show anomaly signatures if they are configured and triggered.
- D
The IPS sensor is not enabled on any firewall policy.
Why wrong: Even if not enabled, the anomaly list might still show configured signatures; this is not the immediate cause.
Quick Answer
The answer is that the anomaly signatures have not triggered any events yet because traffic thresholds have not been exceeded. This is the most likely reason a FortiGate administrator sees an empty list when running the diagnose ips anomaly list command, as anomaly signatures are dynamic and only populate the list when specific traffic patterns exceed configured thresholds. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this concept tests your understanding of how IPS anomaly detection differs from signature-based detection—anomaly signatures are passive until triggered, so an empty output does not indicate a misconfiguration or failure. A common trap is assuming the sensor is broken or the command is wrong, but the key is recognizing that thresholds must be exceeded for entries to appear. Memory tip: think of anomaly signatures as “silent watchers”—they only speak when traffic crosses the line.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 administrator runs the following command and sees: 'diagnose ips anomaly list' returns no entries, but the IPS sensor is configured with anomaly signatures. What is the MOST likely reason the signatures are not appearing?
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.
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 anomaly signatures have not triggered any events yet because traffic thresholds have not been exceeded.
Option C is correct. Anomaly signatures are dynamic; they only appear in the anomaly list when traffic triggers them. Empty output means no thresholds have been exceeded.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 IPS sensor is configured in 'passive' mode, which suppresses anomaly detection.
Why it's wrong here
Passive mode still detects anomalies; it just doesn't block them.
- ✓
The anomaly signatures have not triggered any events yet because traffic thresholds have not been exceeded.
Why this is correct
Anomaly detection is rate-based; signatures only appear when the configured threshold is exceeded. If no traffic has triggered them, the list will be empty.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Anomaly signatures are not displayed by 'diagnose ips anomaly list'; they require a different command.
Why it's wrong here
The command should show anomaly signatures if they are configured and triggered.
- ✗
The IPS sensor is not enabled on any firewall policy.
Why it's wrong here
Even if not enabled, the anomaly list might still show configured signatures; this is not the immediate cause.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The command should show anomaly signatures if they are configured and triggered.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE4 NAT questions on configuration and troubleshooting.
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Security Profiles — study guide chapter
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Security Profiles practice questions
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FAQ
Questions learners often ask
What does this NSE4 question test?
Security Profiles — This question tests Security Profiles — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The anomaly signatures have not triggered any events yet because traffic thresholds have not been exceeded. — Option C is correct. Anomaly signatures are dynamic; they only appear in the anomaly list when traffic triggers them. Empty output means no thresholds have been exceeded.
What should I do if I get this NSE4 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE4 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". 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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This NSE4 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 NSE4 exam.
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