The answer is that the custom IPS signature is missing the mandatory protocol parameter. Without specifying a protocol such as TCP, UDP, or HTTP, the FortiGate IPS engine has no context for which traffic layer to inspect, so even a correctly enabled signature applied to a policy will never trigger an alert. This is a common pitfall on the Fortinet NSE 7 Advanced Security NSE7 exam, which tests your understanding of how custom signatures must include all required fields—especially protocol—to function within the IPS sensor. A frequent trap is assuming that a pattern alone is sufficient, but the engine requires explicit protocol binding to match against flows. Remember the mnemonic: “No protocol, no patrol”—if you omit the protocol, your signature will never patrol the traffic.
NSE7 Advanced Threat Protection Practice Question
This NSE7 practice question tests your understanding of advanced threat protection. 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 network administrator is troubleshooting a FortiGate IPS sensor that is not generating alerts for a custom signature they created. The custom signature uses the pattern 'malicious. The signature is enabled and applied to a firewall policy. What is the MOST likely cause of the issue?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The custom signature is missing the 'protocol' parameter
The custom signature is missing the 'protocol' parameter, which is mandatory for FortiGate custom IPS signatures. Without specifying the protocol (e.g., TCP, UDP, HTTP), the IPS engine cannot match the pattern against any traffic flow, so no alerts are generated even if the signature is enabled and applied to a policy.
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 signature severity is set to 'Low' and logging is disabled for low severity
Why it's wrong here
Even if logging is disabled, the signature would still be evaluated; alerts would be generated if logging is enabled.
✓
The custom signature is missing the 'protocol' parameter
Why this is correct
Custom signatures must specify a protocol decoder (e.g., HTTP, FTP) to be evaluated; without it, the signature is ignored.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The IPS sensor is configured in 'Passive' mode
Why it's wrong here
Passive mode would still generate logs but not block; alerts would still appear.
✗
The firewall policy is using 'Flow-based' inspection
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a missing protocol parameter would cause a syntax error or prevent the signature from being saved, but FortiGate allows saving incomplete custom signatures that simply never match traffic.
Detailed technical explanation
How to think about this question
FortiGate custom signatures require the 'protocol' parameter to define which protocol layer the pattern should be applied to (e.g., TCP, UDP, HTTP, FTP). Without it, the IPS engine has no context to parse the traffic stream and cannot trigger the signature. In practice, administrators often forget this mandatory field when copying signatures from other platforms that infer protocol from context, leading to silent failures.
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.
TExam Day Tips
→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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Advanced Threat Protection — This question tests Advanced Threat Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The custom signature is missing the 'protocol' parameter — The custom signature is missing the 'protocol' parameter, which is mandatory for FortiGate custom IPS signatures. Without specifying the protocol (e.g., TCP, UDP, HTTP), the IPS engine cannot match the pattern against any traffic flow, so no alerts are generated even if the signature is enabled and applied to a policy.
What should I do if I get this NSE7 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator is troubleshooting why a custom IPS signature for protocol anomaly detection is not triggering. The signature is designed to detect abnormal DNS query lengths. Which TWO steps should the administrator take to verify the signature is working? (Choose two.)
medium
A.Reboot the FortiGate to reset the IPS engine
B.Disable the firewall policy to see if the signature triggers
✓ C.Verify that the IPS sensor containing the signature is applied to the correct firewall policy
✓ D.Generate traffic that matches the signature and check the IPS logs for alerts
E.Increase the signature's severity to see it in logs
Why C: To verify a custom IPS signature, the administrator should test it with matching traffic and check the IPS log to confirm detection. Also, ensuring the IPS sensor includes the signature and is applied to a policy is necessary.
Variation 2. An administrator runs 'diagnose ips anomaly list' and sees many 'data_leak' events from a specific internal IP address. The IPS sensor has the default pre-defined signatures enabled. What additional step should the administrator take to block this specific anomaly?
hard
A.Enable protocol anomaly detection in the antivirus profile
✓ B.Create a custom IPS signature to match the anomaly pattern and apply it to the IPS sensor
C.Enable the 'data_leak' signature in the IPS sensor and set action to 'block'
D.Configure a firewall policy with application control to block the traffic
Why B: Option B is correct because protocol anomalies require custom signatures to define the precise pattern or threshold, as pre-defined signatures may not cover specific behavior.
Variation 3. An administrator runs 'diagnose ips anomaly http' and sees many entries with 'type=SQLi' and 'score=0'. What does a score of 0 indicate?
hard
A.The anomaly detection is disabled
✓ B.The traffic showed suspicious patterns but did not meet the threshold
C.The IPS sensor is not applied to any policy
D.The traffic is definitely an SQL injection attack
Why B: In Fortinet's IPS anomaly detection, a score of 0 indicates that the traffic exhibited suspicious patterns (e.g., SQLi signatures) but did not accumulate enough anomaly points to meet the configured threshold for triggering an action. This means the traffic was flagged as potentially malicious but was not deemed severe enough to warrant logging or blocking, so it remains in a 'monitoring' state without enforcement.
Last reviewed: Jun 24, 2026
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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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