The correct answer is RADIUS and local authentication. Palo Alto Networks firewalls support these two primary methods for authenticating administrative users, with local authentication relying on credentials stored directly on the firewall and RADIUS enabling centralized authentication against an external server. TACACS is not supported—only TACACS+ is, but the exam specifically tests the distinction—and LDAP is used for directory lookups rather than direct admin authentication, while SAML is reserved for single sign-on scenarios. On the PCNSA exam, this question tests your understanding of the firewall’s authentication architecture and often appears as a trap where candidates confuse TACACS+ with TACACS or assume LDAP functions as an admin auth method. A reliable memory tip is to remember that the firewall only natively supports two admin authentication methods: local and RADIUS—think “L and R” for “Local and Radius,” and if it’s not one of those two, it’s not a direct admin authentication method.
PCNSA Core Concepts Practice Question
This PCNSA practice question tests your understanding of core concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 are valid methods for authenticating administrative users on Palo Alto Networks firewalls? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Local authentication using local user database
Options A and C are correct. The firewall supports local authentication and RADIUS. Option B is wrong because TACACS is not supported (TACACS+ is, but not TACACS). Option D is wrong because LDAP is used for directory services, not authentication directly (though it can be used for captive portal, but not admin auth). Option E is wrong because SAML is supported for SSO but not typically as a direct admin authentication method.
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.
✓
Local authentication using local user database
Why this is correct
The firewall has a built-in local database for administrator accounts.
Related concept
Authentication checks who the user is.
✓
RADIUS
Why this is correct
RADIUS is a standard authentication protocol supported by PAN-OS.
Related concept
Authentication checks who the user is.
✗
TACACS
Why it's wrong here
TACACS is not supported; TACACS+ is supported, but not TACACS.
✗
SAML
Why it's wrong here
SAML is used for SSO for end users, not typically for administrative access.
✗
LDAP
Why it's wrong here
LDAP is used for retrieving user attributes, not for direct administrator 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 PCNSA questions on access control and AAA configuration.
Core Concepts — This question tests Core Concepts — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Local authentication using local user database — Options A and C are correct. The firewall supports local authentication and RADIUS. Option B is wrong because TACACS is not supported (TACACS+ is, but not TACACS). Option D is wrong because LDAP is used for directory services, not authentication directly (though it can be used for captive portal, but not admin auth). Option E is wrong because SAML is supported for SSO but not typically as a direct admin authentication method.
What should I do if I get this PCNSA 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 PCNSA 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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Question Discussion
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