- A
Create an allow rule for all users, then a deny rule for HR with application social-media.
Why wrong: The deny rule placed after the allow rule will not be reached; traffic will be allowed first.
- B
Create a deny rule for the HR user group with application social-media before the allow rule.
Why wrong: Without user-ID, the firewall cannot identify the HR group by username.
- C
Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it after the allow rule.
Why wrong: Placing the deny after the allow means the allow rule processes first, so traffic is allowed regardless.
- D
Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it before the allow rule.
This correctly uses user-ID and places the deny before the allow to block HR users' social media traffic.
Quick Answer
The correct approach is to use User-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it before the allow rule. This works because Palo Alto Networks firewalls evaluate security rules top-down, so the more specific deny rule must be positioned above the general allow rule to intercept the targeted traffic first; without User-ID, the firewall cannot distinguish HR users from others, making the policy ineffective. On the PCNSA exam, this question tests your understanding of rule ordering and User-ID integration, a common trap being that candidates place the deny rule after the allow rule, which renders it unreachable. Remember the memory tip: “Deny first, allow last—User-ID makes the block stick fast.”
PCNSA Securing Traffic Practice Question
This PCNSA practice question tests your understanding of securing traffic. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An organization has a security policy that allows all traffic from the corporate user zone to the internet, but they want to block access to social media sites only for a specific group of users in the HR department. What is the best approach?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it before the allow rule.
Option D is correct because rules are evaluated top-down; the deny rule must come before the allow rule to block the targeted users. Option A lacks user-ID. Option B order is wrong. Option C places deny after allow, so it will never be hit.
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.
- ✗
Create an allow rule for all users, then a deny rule for HR with application social-media.
Why it's wrong here
The deny rule placed after the allow rule will not be reached; traffic will be allowed first.
- ✗
Create a deny rule for the HR user group with application social-media before the allow rule.
Why it's wrong here
Without user-ID, the firewall cannot identify the HR group by username.
- ✗
Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it after the allow rule.
Why it's wrong here
Placing the deny after the allow means the allow rule processes first, so traffic is allowed regardless.
- ✓
Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it before the allow rule.
Why this is correct
This correctly uses user-ID and places the deny before the allow to block HR users' social media traffic.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
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 PCNSA ACL questions on filtering logic and placement.
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Securing Traffic — study guide chapter
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FAQ
Questions learners often ask
What does this PCNSA question test?
Securing Traffic — This question tests Securing Traffic — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use user-ID to identify HR users and create a deny rule with source zone corporate, source user HR, application social-media, action deny, and place it before the allow rule. — Option D is correct because rules are evaluated top-down; the deny rule must come before the allow rule to block the targeted users. Option A lacks user-ID. Option B order is wrong. Option C places deny after allow, so it will never be hit.
What should I do if I get this PCNSA 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 PCNSA ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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Last reviewed: Jun 24, 2026
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.
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