The answer is that the IPS sensor rule has 'target' set to 'default', which may not match the traffic direction in flow-based inspection. In flow-based inspection, the 'target' parameter determines whether the rule applies to client-to-server traffic, server-to-client traffic, or both; setting it to 'default' often means the rule inherits the protocol decoder's default target, which might be 'server' or 'client' only, causing medium severity attacks to pass if the traffic flows in the opposite direction. On the Fortinet NSE 4 exam, this tests your understanding of how IPS sensors interact with flow-based inspection versus proxy-based inspection, and it’s a common trap to assume 'default' always blocks both directions. Remember the memory tip: "Default is not always both—check the flow direction to avoid the block's growth."
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. 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 sees the following CLI output when checking an IPS sensor: 'config ips sensor edit test config entries edit 1 set severity medium set action block set target default end'. However, attacks with severity medium are still passing. The IPS sensor is applied to a policy with flow-based inspection. What is the likely issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IPS sensor rule has 'target' set to 'default' which may not apply to the traffic direction
In flow-based inspection, the IPS sensor rules may require that the protocol decoder be enabled or that the traffic matches the rule's target (client, server, default). The output shows 'target default' which might not match the traffic flow.
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 IPS sensor is not enabled in the policy
Why it's wrong here
The admin confirms it is applied.
✓
The IPS sensor rule has 'target' set to 'default' which may not apply to the traffic direction
Why this is correct
For flow-based inspection, target must be 'client' or 'server' to match direction. 'default' may not work as expected.
Related concept
Read the scenario before looking for a memorised answer.
✗
The FortiGate needs a FortiSandbox for IPS to work
Medium is appropriate for medium severity attacks.
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 NSE4 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 NSE4 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.
Security Profiles — This question tests Security Profiles — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IPS sensor rule has 'target' set to 'default' which may not apply to the traffic direction — In flow-based inspection, the IPS sensor rules may require that the protocol decoder be enabled or that the traffic matches the rule's target (client, server, default). The output shows 'target default' which might not match the traffic flow.
What should I do if I get this NSE4 question wrong?
Identify which NSE4 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.
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. A FortiGate is configured with an IPS profile to protect a web server. The administrator notices that some attacks are not being detected. The IPS signature database is up to date. What should the administrator check first?
medium
A.Increase the severity level of the IPS sensor.
✓ B.Ensure the IPS profile is applied to the firewall policy that handles traffic to the web server.
C.Disable flow-based inspection and enable proxy-based inspection.
D.Change the IPS signature action from 'default' to 'block'.
Last reviewed: Jun 21, 2026
Question Discussion
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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.
Question Discussion
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