The correct answer is to enable local authentication and configure RADIUS as the primary authentication method with local fallback. This configuration allows the firewall to first attempt authentication against the RADIUS server—typically tied to Active Directory—so network engineers can log in with their existing domain credentials. If the RADIUS server becomes unreachable, the firewall automatically falls back to the local database, preserving access for the emergency local admin account. On the PCNSA exam, this scenario tests your understanding of authentication sequence and redundancy; a common trap is selecting “RADIUS only” or “local only,” which fails to meet both requirements. Remember the priority order: RADIUS first, local as backup. A useful memory tip is “RADIUS rules the day, local saves the way.”
PCNSA Device Management and Services Practice Question
This PCNSA practice question tests your understanding of device management and services. 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 security admin wants to allow network engineers to log in to the firewall using their existing Active Directory credentials while maintaining a local admin account for emergency access. What should be configured?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable local authentication and configure RADIUS as the primary authentication method with local fallback.
Option D is correct because it allows the firewall to use RADIUS as the primary authentication method, enabling network engineers to authenticate with their existing Active Directory credentials, while maintaining a local admin account for emergency access when the RADIUS server is unreachable. This configuration ensures that local authentication is available as a fallback, meeting the requirement for both centralized AD-based login and a local emergency account.
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.
✗
Create local accounts for all engineers and sync with AD manually.
Why it's wrong here
Incorrect: Manual sync is impractical and does not leverage AD.
✗
Use Kerberos authentication only.
Why it's wrong here
Incorrect: Kerberos requires a KDC and no fallback is configured.
✗
Configure only RADIUS authentication and disable local authentication.
Why it's wrong here
Incorrect: If RADIUS fails, no access possible; local account is needed for emergency.
✓
Enable local authentication and configure RADIUS as the primary authentication method with local fallback.
Why this is correct
Correct: This allows AD authentication while local admin account remains available for fallback.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Kerberos or LDAP is the only way to integrate with Active Directory, or they mistakenly think that disabling local authentication is acceptable, overlooking the critical requirement for emergency access when the external authentication server is unavailable.
Detailed technical explanation
How to think about this question
Palo Alto Networks firewalls support RADIUS as an authentication method for administrative users, where the firewall acts as a RADIUS client and forwards credentials to a RADIUS server (e.g., NPS) that authenticates against Active Directory. The 'authentication profile' configuration allows setting RADIUS as the primary method with 'allow local' fallback, which ensures that if the RADIUS server is unreachable (e.g., due to network failure), the firewall falls back to the local database, preserving emergency access. This is configured under Device > Authentication Profile, where the 'Authentication' tab includes options for 'RADIUS' and 'Allow List' for local users.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Device Management and Services — This question tests Device Management and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable local authentication and configure RADIUS as the primary authentication method with local fallback. — Option D is correct because it allows the firewall to use RADIUS as the primary authentication method, enabling network engineers to authenticate with their existing Active Directory credentials, while maintaining a local admin account for emergency access when the RADIUS server is unreachable. This configuration ensures that local authentication is available as a fallback, meeting the requirement for both centralized AD-based login and a local emergency account.
What should I do if I get this PCNSA 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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This PCNSA practice question is part of Courseiva's free Palo Alto Networks 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 PCNSA exam.
Question Discussion
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