- A
Install the FortiGate's CA certificate on each client device's trusted root certificate store
Installing the CA certificate makes the clients trust the certificates issued by FortiGate, eliminating warnings.
- B
Disable SSL deep inspection and rely on flow-based antivirus
Why wrong: Disabling SSL inspection reduces security; the problem is still certificate trust.
- C
Change the SSL inspection mode to certificate inspection only
Why wrong: Certificate inspection only examines the certificate without decrypting, which may not provide full content inspection. Additionally, users might still see warnings if the certificate is not trusted.
- D
Configure an SSL certificate exemption for all HTTPS traffic
Why wrong: Exemptions bypass SSL inspection entirely, reducing security and not resolving the warning for traffic that is inspected.
Quick Answer
The answer is to install the FortiGate's CA certificate on each client device's trusted root certificate store. This is correct because when SSL deep inspection is enabled with a self-signed CA, the FortiGate generates a new certificate for each HTTPS site on the fly, signed by its own internal CA. Browsers do not inherently trust this self-signed CA, so they flag the connection with a certificate warning. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this scenario tests your understanding of how SSL inspection trust chains work and the distinction between server-side configuration and client-side trust. A common trap is assuming that disabling certificate validation on the FortiGate itself will fix the browser warning, but the warning originates on the client, not the firewall. Remember the memory tip: "Client trust, not firewall fuss"—the warning disappears only when the client trusts the signing authority.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 FortiGate is configured with SSL deep inspection using a self-signed CA certificate. Users report that they see a certificate warning in their browser when accessing HTTPS sites. The admin wants to eliminate these warnings. What should the admin do?
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
Install the FortiGate's CA certificate on each client device's trusted root certificate store
The certificate warning appears because the client does not trust the self-signed CA used by FortiGate. To eliminate warnings, the FortiGate's CA certificate must be installed in the trusted root store of each client device.
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.
- ✓
Install the FortiGate's CA certificate on each client device's trusted root certificate store
Why this is correct
Installing the CA certificate makes the clients trust the certificates issued by FortiGate, eliminating warnings.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Disable SSL deep inspection and rely on flow-based antivirus
Why it's wrong here
Disabling SSL inspection reduces security; the problem is still certificate trust.
- ✗
Change the SSL inspection mode to certificate inspection only
Why it's wrong here
Certificate inspection only examines the certificate without decrypting, which may not provide full content inspection. Additionally, users might still see warnings if the certificate is not trusted.
- ✗
Configure an SSL certificate exemption for all HTTPS traffic
Why it's wrong here
Exemptions bypass SSL inspection entirely, reducing security and not resolving the warning for traffic that is inspected.
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.
- →
Security Profiles — study guide chapter
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Security Profiles practice questions
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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: Install the FortiGate's CA certificate on each client device's trusted root certificate store — The certificate warning appears because the client does not trust the self-signed CA used by FortiGate. To eliminate warnings, the FortiGate's CA certificate must be installed in the trusted root store of each client device.
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.
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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