The answer is that SSL inspection is not configured and applied to the firewall policy. This is the most likely missing configuration because application control identifies applications by inspecting the content of traffic, and HTTPS encryption hides that payload from the firewall. Without SSL inspection to decrypt the traffic, the FortiGate cannot read the application-layer data to match it against application control signatures, so encrypted web applications simply pass through unidentified. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding that application control is payload-dependent, not just port-based—a common trap is assuming HTTPS traffic on port 443 is automatically identified. Remember the memory tip: “No decrypt, no detect” for encrypted traffic.
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 network administrator is troubleshooting why certain web-based applications are not being identified by application control. The applications are accessed over HTTPS. What is the most likely missing configuration?
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
✓
SSL inspection is not configured and applied to the firewall policy.
Application control relies on inspecting the content of traffic to identify applications. When traffic is encrypted with HTTPS, the firewall cannot inspect the payload without decrypting it first. Therefore, SSL inspection must be configured and applied to the firewall policy to allow the FortiGate to decrypt the traffic and match it against application control signatures.
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.
✗
Web filter profile is not applied to the firewall policy.
Why it's wrong here
Web filter is for URLs, not application identification.
✓
SSL inspection is not configured and applied to the firewall policy.
Why this is correct
SSL inspection is required to decrypt HTTPS for application control to work.
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.
✗
Deep packet inspection is not enabled on the firewall policy.
Why it's wrong here
Deep packet inspection is a broader term; SSL inspection specifically decrypts HTTPS.
✗
IPS is not enabled on the firewall policy.
Why it's wrong here
IPS does not help with application identification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'deep packet inspection' with 'SSL inspection,' but DPI is a broader concept that includes many inspection types, and the specific missing piece for HTTPS application identification is SSL inspection, not DPI as a whole.
Detailed technical explanation
How to think about this question
FortiGate uses a proxy-based or flow-based inspection engine. For HTTPS traffic, the firewall must perform SSL/TLS interception by presenting a certificate to the client and decrypting the session. Without this, the firewall only sees encrypted packets and cannot match application signatures that rely on HTTP headers, SNI, or payload patterns. In real-world scenarios, administrators often forget to generate and install a CA certificate on clients, causing SSL inspection to fail silently.
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: SSL inspection is not configured and applied to the firewall policy. — Application control relies on inspecting the content of traffic to identify applications. When traffic is encrypted with HTTPS, the firewall cannot inspect the payload without decrypting it first. Therefore, SSL inspection must be configured and applied to the firewall policy to allow the FortiGate to decrypt the traffic and match it against application control signatures.
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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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.
Question Discussion
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