The correct answer is that IPS signatures can have their actions overridden in an IPS filter. This is true because FortiGate allows administrators to create granular IPS filters that modify the default action of individual signatures—for example, changing a signature’s action from “pass” to “block” without altering the original signature database. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding of how IPS sensors are applied directly to firewall policies, enabling per-flow inspection control. A common trap is confusing IPS sensors with IPS filters: sensors define which signatures are active, while filters override those signatures’ actions. Remember the memory tip: “Sensors select, filters override”—the filter is the final authority on what happens when a signature triggers.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements about IPS in FortiGate are true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPS can be applied to individual firewall policies via IPS sensors.
Option A is correct because IPS sensors are applied directly to individual firewall policies, allowing granular control over which traffic is inspected for intrusions. This enables administrators to enforce different IPS profiles for different traffic flows, such as applying a stricter sensor to internet-bound traffic and a lighter one to internal traffic.
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.
✓
IPS can be applied to individual firewall policies via IPS sensors.
Why this is correct
IPS sensors are attached to firewall policies to enable IPS on selected traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
An IPS sensor can only be applied to one firewall policy.
Why it's wrong here
An IPS sensor can be reused across multiple policies.
IPS works in both flow and proxy modes, though flow is recommended for performance.
✓
IPS signatures can have their actions overridden in an IPS filter.
Why this is correct
IPS filters allow you to override the default action of a signature.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume IPS requires routed mode or flow-based inspection only, but FortiGate supports IPS in transparent mode and in both inspection modes, and sensors are reusable across multiple policies.
Detailed technical explanation
How to think about this question
IPS sensors in FortiGate are composed of signature-based and anomaly-based filters, and they can be combined with custom IPS filters to override default actions (e.g., changing a signature from 'pass' to 'block'). In transparent mode, the FortiGate operates as a Layer 2 bridge, yet IPS inspection still occurs by examining packets as they pass through, leveraging the same detection engine as in routed mode. A real-world scenario is deploying IPS on a transparent firewall between a branch office and the internet to block known exploit attempts without altering the IP addressing scheme.
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.
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: IPS can be applied to individual firewall policies via IPS sensors. — Option A is correct because IPS sensors are applied directly to individual firewall policies, allowing granular control over which traffic is inspected for intrusions. This enables administrators to enforce different IPS profiles for different traffic flows, such as applying a stricter sensor to internet-bound traffic and a lighter one to internal traffic.
What should I do if I get this NSE4 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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