The answer is that outdated application control signatures are the most likely reason Fortnite is not being blocked. This is because FortiGate’s application control relies on regularly updated signature databases from FortiGuard to identify the latest traffic patterns, encrypted handshakes, and protocol variants used by games like Fortnite; without current signatures, even a correctly applied profile with UTM enabled cannot match new or updated application behaviors. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding that application control is signature-dependent and that stale signatures create a common bypass scenario, often disguised by administrators who assume a correctly configured policy is sufficient. A frequent trap is overlooking signature update schedules or assuming the profile alone blocks all versions of an application. Memory tip: think “signatures expire, blocks expire”—if the signatures are old, the block is hollow.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 mid-sized company has a FortiGate 100F running FortiOS 7.2. They have two internal networks: Trusted (10.1.1.0/24) for employees and Guest (10.2.2.0/24) for visitors. The Guest network has a firewall policy that allows internet access only, with an application control profile that blocks all peer-to-peer and gaming applications. Recently, users on the Guest network have been able to play online games (e.g., Fortnite) despite the block. The administrator checks the application control profile and confirms that 'Fortnite' is listed as blocked. There are no other policies allowing Guest traffic. The administrator also notices that the Guest policy has 'set utm-status enable' and the application control profile is applied. What is the most likely reason that Fortnite is not being blocked?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application control signatures are outdated and do not include the latest Fortnite signatures.
Option D is correct because if the Application Control signatures are outdated, the FortiGate may not recognize the latest Fortnite traffic patterns or encrypted handshakes, allowing the game to bypass the block. Even though the policy has UTM enabled and the profile is applied, stale signatures cannot match new application variants or updates. Regularly updating the IPS/Application Control database via FortiGuard is essential to maintain effective blocking.
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.
✗
The firewall policy is missing 'set deep-inspection enable' for application control to work.
Why it's wrong here
Deep inspection is not mandatory for application control.
✗
SSL inspection is required to block encrypted game traffic, and it is not enabled.
Why it's wrong here
Application control can block games without SSL inspection using IP/port heuristics.
✗
The application control profile is not applied to the correct policy.
Why it's wrong here
The profile is applied to the Guest policy as stated.
✓
The application control signatures are outdated and do not include the latest Fortnite signatures.
Why this is correct
Outdated signatures may miss new application traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 SSL inspection is mandatory for blocking encrypted applications, but the real issue is that outdated signatures fail to recognize the latest application variants, even when the profile is correctly applied and UTM is enabled.
Detailed technical explanation
How to think about this question
FortiGate Application Control relies on a regularly updated signature database from FortiGuard to identify application traffic by patterns such as HTTP headers, TLS SNI, or protocol fingerprints. When a game like Fortnite updates its client or encryption methods, the old signatures may no longer match, allowing the traffic to pass as 'unknown' or be misclassified. Administrators should enable automatic signature updates and verify the FortiGuard subscription status to ensure real-time protection against evolving applications.
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: The application control signatures are outdated and do not include the latest Fortnite signatures. — Option D is correct because if the Application Control signatures are outdated, the FortiGate may not recognize the latest Fortnite traffic patterns or encrypted handshakes, allowing the game to bypass the block. Even though the policy has UTM enabled and the profile is applied, stale signatures cannot match new application variants or updates. Regularly updating the IPS/Application Control database via FortiGuard is essential to maintain effective blocking.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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