The answer is anomaly detection and IPS signatures. Anomaly detection identifies traffic that deviates from established baselines, such as sudden spikes in connection attempts, which can indicate zero-day or protocol-based attacks. IPS signatures, meanwhile, are predefined patterns that match known exploit code, allowing the FortiGate to block threats like SQL injection or buffer overflows before they reach the web server. On the NSE4 exam, this pairing tests your understanding that IPS is not a single tool but a layered strategy: signatures handle the known, while anomaly detection catches the unknown. A common trap is choosing only one feature, forgetting that the question explicitly asks for both blocking exploits and detecting anomalies. Remember the mnemonic "SAD" — Signatures for known Attacks, Anomaly for Deviations — to keep both required features top of mind.
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.
A FortiGate administrator is configuring intrusion prevention (IPS) for a web server. The administrator wants to both block known exploits and detect anomalous traffic patterns. Which TWO features should be enabled? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPS signatures
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
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 signatures
Why this is correct
IPS signatures detect and block known exploits based on pattern matching.
Related concept
Static NAT maps one inside address to one outside address.
✗
Web filter
Why it's wrong here
Web filter controls access to URLs, not intrusion detection.
✗
Antivirus
Why it's wrong here
Antivirus scans files for malware, not exploits or anomalies.
✓
Anomaly detection
Why this is correct
Anomaly detection identifies traffic patterns that deviate from normal baselines, such as port scans or floods.
Related concept
Static NAT maps one inside address to one outside address.
✗
Application control
Why it's wrong here
Application control identifies applications, not exploits or anomalies.
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.
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.
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: IPS signatures
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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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