PCNSE Practice Question: Securing Users and Applications with Authentication
This PCNSE practice question tests your understanding of securing users and applications with authentication. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user is prompted to authenticate via the configured authentication profile.
Option C is correct. When a user with an unknown identity (source-user unknown) attempts to access resources in 192.168.1.0/24 and the policy rule action is 'allow-authentication', the firewall prompts the user to authenticate via the configured authentication profile. Option A is incorrect because the action is not 'deny', so traffic is not blocked solely due to unknown source-user. Option B is incorrect because the traffic is not allowed without authentication; the 'allow-authentication' action requires successful authentication. Option D is incorrect because the action is specifically 'allow-authentication' which triggers an authentication prompt using the configured method (which may be captive portal, but the term 'redirect to captive portal' is less precise than 'prompted to authenticate').
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The traffic is blocked because the source-user is 'unknown'.
Why it's wrong here
The policy action is 'allow-authentication', not 'deny'.
✗
The traffic is allowed without authentication because the source-user is 'unknown'.
Why it's wrong here
The policy matches unknown users and enforces authentication; traffic is not allowed until authentication succeeds.
✓
The user is prompted to authenticate via the configured authentication profile.
Why this is correct
The 'allow-authentication' action initiates an authentication challenge for the user.
Related concept
Standard ACLs match source addresses.
✗
The user is redirected to the captive portal.
Why it's wrong here
The authentication profile may use SAML, not captive portal.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSE ACL questions on filtering logic and placement.
Securing Users and Applications with Authentication — This question tests Securing Users and Applications with Authentication — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The user is prompted to authenticate via the configured authentication profile. — Option C is correct. When a user with an unknown identity (source-user unknown) attempts to access resources in 192.168.1.0/24 and the policy rule action is 'allow-authentication', the firewall prompts the user to authenticate via the configured authentication profile. Option A is incorrect because the action is not 'deny', so traffic is not blocked solely due to unknown source-user. Option B is incorrect because the traffic is not allowed without authentication; the 'allow-authentication' action requires successful authentication. Option D is incorrect because the action is specifically 'allow-authentication' which triggers an authentication prompt using the configured method (which may be captive portal, but the term 'redirect to captive portal' is less precise than 'prompted to authenticate').
What should I do if I get this PCNSE question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSE ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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