This NSE4 practice question tests your understanding of authentication and vpn. 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 administrator is configuring RADIUS authentication for firewall users. Which THREE steps are required to complete the configuration? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a firewall policy with the user group set in 'users/groups'
To configure RADIUS authentication, you must define the RADIUS server, create a user group that references the RADIUS server, and then configure a firewall policy that uses that user group for authentication. The RADIUS server itself needs to be accessible, but the configuration steps on FortiGate are these three.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Import the RADIUS server certificate into FortiGate
Why it's wrong here
Certificate import is not required for RADIUS; it uses shared secrets.
✓
Configure a firewall policy with the user group set in 'users/groups'
Why this is correct
The firewall policy enforces authentication for traffic.
Related concept
Authentication checks who the user is.
✓
Define the RADIUS server under 'config user radius'
Why this is correct
This is where the server IP, secret, and settings are configured.
Related concept
Authentication checks who the user is.
✓
Create a user group that uses the RADIUS server as the authentication source
Why this is correct
The user group ties the server to policies.
Related concept
Authentication checks who the user is.
✗
Enable 'set auth-type radius' on the interface
Why it's wrong here
Interface authentication type is not used for firewall user authentication.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related NSE4 questions on access control and AAA configuration.
Authentication and VPN — This question tests Authentication and VPN — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Configure a firewall policy with the user group set in 'users/groups' — To configure RADIUS authentication, you must define the RADIUS server, create a user group that references the RADIUS server, and then configure a firewall policy that uses that user group for authentication. The RADIUS server itself needs to be accessible, but the configuration steps on FortiGate are these three.
What should I do if I get this NSE4 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related NSE4 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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