The answer is that three steps are required: enabling SSL deep inspection on the firewall policy, applying the IPS profile to the same policy, and installing the FortiGate’s CA certificate on client machines. This is necessary because HTTPS traffic is encrypted, so the IPS engine cannot inspect the payload unless the FortiGate acts as a man-in-the-middle, decrypting the traffic with its own CA certificate and re-encrypting it after inspection. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this scenario tests your understanding of SSL deep inspection prerequisites and the critical distinction between inspection and certificate trust—a common trap is forgetting that clients must trust the FortiGate’s CA to avoid browser warnings. Remember the mnemonic “Policy, Profile, Certificate” to recall that enabling inspection on the policy, attaching the IPS profile, and distributing the CA certificate are all mandatory for inspecting HTTPS traffic with IPS.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to ensure that all HTTPS traffic to a critical server is inspected by the IPS. The server uses a valid certificate from a public CA. Which THREE steps are required to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply an IPS profile to the same firewall policy
Options A, D, and E are correct. SSL deep inspection must be enabled on the policy (A), the IPS profile must be applied in the same policy (D), and the FortiGate's CA certificate must be installed on clients (E) to avoid certificate errors.
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.
✓
Apply an IPS profile to the same firewall policy
Why this is correct
IPS profile must be applied to the policy to inspect decrypted traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set the Antivirus profile to 'Deep Inspection'
Why it's wrong here
Antivirus profiles have inspection modes, but deep inspection is a feature of the policy, not the antivirus profile itself.
✓
Install the FortiGate's CA certificate on client browsers
Why this is correct
To avoid certificate warnings, clients must trust the FortiGate's CA.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable SSL deep inspection on the firewall policy
Why this is correct
Without deep inspection, encrypted traffic cannot be inspected by IPS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upload the server's certificate to the FortiGate
Why it's wrong here
FortiGate generates a signed certificate in real-time; uploading server certificate is not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the NSE4 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Apply an IPS profile to the same firewall policy — Options A, D, and E are correct. SSL deep inspection must be enabled on the policy (A), the IPS profile must be applied in the same policy (D), and the FortiGate's CA certificate must be installed on clients (E) to avoid certificate errors.
What should I do if I get this NSE4 question wrong?
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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