- A
The application control profile does not have deep inspection enabled for HTTPS traffic
Application control requires SSL deep inspection to identify applications in encrypted traffic. If the profile's 'Other Applications' or specific application signatures are not set to block, it may not work.
- B
Users are accessing the sites via IP address instead of domain name
Why wrong: Even if users use IP addresses, application control can still detect the application by analyzing traffic patterns, though it may be harder.
- C
The firewall policy is using a proxy policy instead of an explicit policy
Why wrong: Proxy policy is not a standard concept; policies are either explicit or implicit. This is unlikely to be the issue.
- D
The application signatures for Facebook and Twitter are outdated
Why wrong: Outdated signatures would not cause a complete bypass; the profile would still attempt to match.
Quick Answer
The answer is that the application control profile does not have deep inspection enabled for HTTPS traffic. Even when SSL deep inspection is enabled on the firewall policy, the application control profile itself must be configured to inspect HTTPS traffic; without this, the FortiGate cannot decrypt the encrypted payload to read the HTTP Host header or SNI, which are the key identifiers for application signatures like Facebook and Twitter. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this question tests your understanding that application control for HTTPS relies on decryption at the profile level, not just the policy level—a common trap is assuming policy-level SSL inspection alone is sufficient. Remember the memory tip: “Policy decrypts, profile inspects”—the policy enables the pipe, but the profile must choose to look inside it.
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.
An admin has configured an application control profile to block 'Facebook' and 'Twitter' using application signatures. Users can still access these sites via HTTPS. The firewall policy has SSL deep inspection enabled and the application control profile is applied. What is the MOST likely cause?
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 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
The application control profile does not have deep inspection enabled for HTTPS traffic
Option A is correct. Application control signatures for web-based applications often rely on the HTTP Host header or SNI. Without deep inspection, the FortiGate cannot see the hostname in encrypted HTTPS traffic, so it cannot identify the application. Even with SSL deep inspection enabled, the profile must be configured to inspect HTTPS traffic; if the application control profile's 'Other Applications' category is not set to block, it might pass.
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.
- ✓
The application control profile does not have deep inspection enabled for HTTPS traffic
Why this is correct
Application control requires SSL deep inspection to identify applications in encrypted traffic. If the profile's 'Other Applications' or specific application signatures are not set to block, it may not work.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Users are accessing the sites via IP address instead of domain name
Why it's wrong here
Even if users use IP addresses, application control can still detect the application by analyzing traffic patterns, though it may be harder.
- ✗
The firewall policy is using a proxy policy instead of an explicit policy
Why it's wrong here
Proxy policy is not a standard concept; policies are either explicit or implicit. This is unlikely to be the issue.
- ✗
The application signatures for Facebook and Twitter are outdated
Why it's wrong here
Outdated signatures would not cause a complete bypass; the profile would still attempt to match.
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.
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FAQ
Questions learners often ask
What does this NSE4 question test?
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: The application control profile does not have deep inspection enabled for HTTPS traffic — Option A is correct. Application control signatures for web-based applications often rely on the HTTP Host header or SNI. Without deep inspection, the FortiGate cannot see the hostname in encrypted HTTPS traffic, so it cannot identify the application. Even with SSL deep inspection enabled, the profile must be configured to inspect HTTPS traffic; if the application control profile's 'Other Applications' category is not set to block, it might pass.
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.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 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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