- A
The private key of each server certificate that will be inspected.
Why wrong: The FortiGate generates new certificates; it does not need the server's private key.
- B
The FortiGate's CA certificate installed in the Trusted Root Certification Authorities store on client machines.
Without this, clients will see certificate errors.
- C
An intermediate CA certificate imported from the enterprise PKI.
Why wrong: Optional; only needed if integrating with an existing PKI.
- D
A certificate on the FortiGate to generate session certificates.
This is the FortiGate's own certificate used to sign the certificates presented to clients.
- E
A certificate signed by a public CA installed on the FortiGate.
Why wrong: A self-signed CA on FortiGate is sufficient for internal inspection.
Quick Answer
The answer is a CA certificate on the FortiGate and a session certificate generated for each connection. Full SSL inspection requires the FortiGate to act as a man-in-the-middle, decrypting traffic and re-encrypting it with a dynamically created session certificate for each HTTPS session. This session certificate must be signed by a trusted CA certificate stored on the FortiGate, and that CA certificate must be pre-installed in the client’s Trusted Root Certification Authorities store to avoid browser warnings. On the Fortinet NSE 4 exam, this concept tests your understanding of how deep packet inspection differs from certificate inspection alone; a common trap is assuming only the session certificate is needed, forgetting the CA certificate that signs it. Remember the memory tip: “CA signs, session serves”—the CA certificate provides the trust anchor, while the session certificate is the temporary key for each connection.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Which TWO of the following are required for full SSL inspection to work correctly?
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 FortiGate's CA certificate installed in the Trusted Root Certification Authorities store on client machines.
For full SSL inspection, the FortiGate must generate a session certificate on-the-fly for each HTTPS connection after decrypting it. This requires a CA certificate on the FortiGate to sign those session certificates. Additionally, client machines must trust this CA certificate, so it must be installed in their Trusted Root Certification Authorities store; otherwise, browsers will show certificate warnings and block the connection.
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 private key of each server certificate that will be inspected.
Why it's wrong here
The FortiGate generates new certificates; it does not need the server's private key.
- ✓
The FortiGate's CA certificate installed in the Trusted Root Certification Authorities store on client machines.
Why this is correct
Without this, clients will see certificate errors.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An intermediate CA certificate imported from the enterprise PKI.
Why it's wrong here
Optional; only needed if integrating with an existing PKI.
- ✓
A certificate on the FortiGate to generate session certificates.
Why this is correct
This is the FortiGate's own certificate used to sign the certificates presented to clients.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A certificate signed by a public CA installed on the FortiGate.
Why it's wrong here
A self-signed CA on FortiGate is sufficient for internal inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think the FortiGate needs the server's private key (Option A) to decrypt traffic, but in reality, full SSL inspection uses a man-in-the-middle approach where the FortiGate generates its own session certificates, requiring only its own CA certificate and client trust.
Detailed technical explanation
How to think about this question
During full SSL inspection, the FortiGate acts as a man-in-the-middle: it terminates the client's TLS connection using a dynamically generated session certificate signed by the FortiGate's CA, then initiates a new TLS connection to the real server. The session certificate must have the same Subject Alternative Name (SAN) as the original server certificate to avoid hostname mismatch errors. The FortiGate's CA certificate must be distributed to clients via Group Policy or manual installation; if not, clients will see 'untrusted certificate' warnings, breaking the inspection.
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 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 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
- →
Security Profiles practice questions
Targeted practice on this topic area only
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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: The FortiGate's CA certificate installed in the Trusted Root Certification Authorities store on client machines. — For full SSL inspection, the FortiGate must generate a session certificate on-the-fly for each HTTPS connection after decrypting it. This requires a CA certificate on the FortiGate to sign those session certificates. Additionally, client machines must trust this CA certificate, so it must be installed in their Trusted Root Certification Authorities store; otherwise, browsers will show certificate warnings and block the connection.
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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