PCNSE Practice Question: Securing Users and Applications with Authentication
This PCNSE practice question tests your understanding of securing users and applications with authentication. 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.
A security architect needs to enforce authentication for all application-based policies using an external authentication source with MFA. Which combination of features best achieves this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SAML authentication with an identity provider that supports MFA
Option B is correct because SAML with an IdP that supports MFA allows the firewall to delegate authentication to the IdP, which can enforce MFA. Option A is incorrect because Kerberos does not natively support MFA. Option C is incorrect because local user database does not support external MFA. Option D is incorrect because RADIUS with one-time passwords may require additional infrastructure and is less flexible than SAML for MFA.
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 user database with password policies
Why it's wrong here
Local database does not support external MFA solutions.
✓
SAML authentication with an identity provider that supports MFA
Why this is correct
SAML allows the firewall to redirect users to the IdP for authentication, including MFA challenges.
Clue confirmation
The clue word "best" in the question point toward this answer.
RADIUS authentication with one-time passwords via token
Why it's wrong here
While possible, RADIUS OTP is less flexible and scalable than SAML with MFA.
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 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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PCNSE questions on access control and AAA configuration.
Securing Users and Applications with Authentication — This question tests Securing Users and Applications with Authentication — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: SAML authentication with an identity provider that supports MFA — Option B is correct because SAML with an IdP that supports MFA allows the firewall to delegate authentication to the IdP, which can enforce MFA. Option A is incorrect because Kerberos does not natively support MFA. Option C is incorrect because local user database does not support external MFA. Option D is incorrect because RADIUS with one-time passwords may require additional infrastructure and is less flexible than SAML for MFA.
What should I do if I get this PCNSE 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 PCNSE questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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