- A
Create a firewall policy to block all traffic to ports commonly used by social media (e.g., TCP 443).
Why wrong: Blocking port 443 would also block Office 365 and other HTTPS traffic, which is not the requirement.
- B
Use a web filter profile to block URLs containing 'facebook' or 'twitter'.
Why wrong: Web filtering based on keywords is imprecise and may block legitimate content or miss social media apps using other URLs.
- C
Configure an application control profile with rules to block social media applications and allow Office 365 applications.
Application control profiles can precisely allow or block applications regardless of port/protocol, meeting the requirement exactly.
- D
Implement a DNS filter to block DNS queries for social media domains.
Why wrong: DNS filtering would block the domain but not the application if the user accesses via IP or if the app uses a different domain.
Quick Answer
The correct approach is to configure an application control profile with rules to block social media applications and allow Office 365 applications. This works because FortiGate’s application control engine uses deep packet inspection (DPI) to identify applications by their unique signatures, not just by port or protocol. Since both social media and Office 365 commonly use HTTPS on TCP 443, traditional port-based filtering or URL filtering would fail to differentiate them, but application control can precisely permit cloud productivity tools while blocking social media traffic. On the Fortinet NSE 4 exam, this scenario tests your understanding of how application control provides granular, signature-based visibility over web traffic, and it often appears as a distractor against URL filtering or simple firewall policies. A common trap is assuming URL filtering alone can handle HTTPS traffic, but application control is required for app-level granularity. Memory tip: think “App Control, not URL, for app-level rules—signatures see what ports miss.”
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 company is deploying FortiGate for outbound web filtering. They want to block users from accessing social media sites during business hours, but still allow access to cloud-based productivity tools like Office 365. Which approach should the administrator use to meet this requirement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure an application control profile with rules to block social media applications and allow Office 365 applications.
Application control is the correct approach because it can identify and control applications like social media and Office 365 based on their unique signatures, regardless of the ports or protocols they use. Unlike URL filtering or port blocking, application control can differentiate between Office 365 traffic and social media traffic even when both use HTTPS on TCP 443, allowing the administrator to block social media while permitting cloud productivity tools.
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.
- ✗
Create a firewall policy to block all traffic to ports commonly used by social media (e.g., TCP 443).
Why it's wrong here
Blocking port 443 would also block Office 365 and other HTTPS traffic, which is not the requirement.
- ✗
Use a web filter profile to block URLs containing 'facebook' or 'twitter'.
Why it's wrong here
Web filtering based on keywords is imprecise and may block legitimate content or miss social media apps using other URLs.
- ✓
Configure an application control profile with rules to block social media applications and allow Office 365 applications.
Why this is correct
Application control profiles can precisely allow or block applications regardless of port/protocol, meeting the requirement exactly.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Implement a DNS filter to block DNS queries for social media domains.
Why it's wrong here
DNS filtering would block the domain but not the application if the user accesses via IP or if the app uses a different domain.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume URL filtering or port blocking is sufficient, but the NSE4 exam tests the understanding that application control is required when applications share the same port (e.g., TCP 443) and need to be differentiated based on their behavior, not just their domain or port.
Trap categories for this question
Keyword trap
Web filtering based on keywords is imprecise and may block legitimate content or miss social media apps using other URLs.
Detailed technical explanation
How to think about this question
Application control in FortiGate uses deep packet inspection (DPI) to analyze traffic patterns, including HTTP/HTTPS headers, TLS SNI, and behavioral fingerprints, to identify applications even when they are encrypted. For Office 365, FortiGate's application signatures can distinguish between Exchange Online, SharePoint, and Teams traffic, while social media signatures detect platforms like Facebook, Twitter, and Instagram. This granularity ensures that blocking is application-specific rather than port- or domain-based, which is critical in modern networks where multiple applications share the same transport layer.
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 — study guide chapter
Learn the concepts, then practise the questions
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Security Profiles practice questions
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FAQ
Questions learners often ask
What does this NSE4 question test?
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: Configure an application control profile with rules to block social media applications and allow Office 365 applications. — Application control is the correct approach because it can identify and control applications like social media and Office 365 based on their unique signatures, regardless of the ports or protocols they use. Unlike URL filtering or port blocking, application control can differentiate between Office 365 traffic and social media traffic even when both use HTTPS on TCP 443, allowing the administrator to block social media while permitting cloud productivity tools.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
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.
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