The answer is content filtering with a block rule for the file extensions. This is correct because content filtering operates at the application layer, inspecting HTTP response bodies to identify and block specific file types like .exe and .scr as they are downloaded, whereas URL filtering or DNS filtering only control access at the request level and cannot see the file content. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this question tests your understanding of how web filter components differ in scope—content filtering is the only feature that can block file downloads by extension for both HTTP and HTTPS, provided SSL deep inspection is enabled to decrypt the traffic. A common trap is confusing content filtering with URL filtering or application control, which do not inspect response payloads. Remember the memory tip: “Content catches the file; URL only blocks the site.”
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.
An organization wants to prevent users from downloading files with extensions such as .exe and .scr via HTTP and HTTPS. The FortiGate already has a web filter profile applied to the relevant policy. Which web filter feature should be configured to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Content filtering with a block rule for the file extensions
Option D is correct. Content filtering inspects HTTP response bodies and can block file downloads by extension. For HTTPS, SSL deep inspection must be enabled.
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.
✗
FortiGuard category filtering set to block 'Malicious Websites'
Why it's wrong here
Category filtering blocks entire sites, not specific file types.
✗
A static URL filter block rule for the file extensions
Why it's wrong here
URL filter does not inspect file extensions in HTTP body.
✗
URL filter with a block rule for *\.exe and *\.scr patterns
Why it's wrong here
URL filter matches URLs, not file extensions in downloads.
✓
Content filtering with a block rule for the file extensions
Why this is correct
Content filtering can block based on file extension patterns in HTTP responses, including for HTTPS if SSL inspection is enabled.
Related concept
Static NAT maps one inside address to one outside address.
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: Content filtering with a block rule for the file extensions — Option D is correct. Content filtering inspects HTTP response bodies and can block file downloads by extension. For HTTPS, SSL deep inspection must be enabled.
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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Question Discussion
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