The answer is an Application Control profile. This is the correct choice because Application Control uses deep packet inspection to identify and block social media applications like Facebook and Twitter based on their unique application signatures, rather than relying solely on URL filtering or web categories. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this concept tests your understanding of how FortiGate differentiates between application-layer controls and other security profiles like Web Filtering or IPS. A common trap is assuming that blocking social media requires a Web Filter profile, but Web Filter only blocks by URL or category, whereas Application Control can block the actual app traffic even if users access it via a mobile app or encrypted connection. To remember this, think: “Apps need App Control” — if you want to block the application itself, not just the website, you must use an Application Control profile.
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.
An administrator wants to block the use of social media applications like Facebook and Twitter on the company network. Which security profile should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Application Control profile
Option B is correct. Application control can identify and block specific applications based on signatures, including social media apps.
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.
✗
DNS Filter profile
Why it's wrong here
DNS filtering can block domain names but not the application itself if it uses multiple domains.
✗
Web Filter profile
Why it's wrong here
Web filtering blocks URLs, not applications. Facebook can be accessed via multiple URLs.
✓
Application Control profile
Why this is correct
Application control can block the Facebook and Twitter applications regardless of the URL used.
Related concept
Static NAT maps one inside address to one outside address.
✗
IPS profile
Why it's wrong here
IPS is for intrusion prevention, not application blocking.
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: Application Control profile — Option B is correct. Application control can identify and block specific applications based on signatures, including social media apps.
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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