- A
Create an allow rule for all users, then a deny rule for HR with application social-media.
Why wrong: This approach fails because the allow rule is placed first, so all traffic, including HR users attempting to access social media, will match the allow rule and be permitted. The subsequent deny rule will never be evaluated for traffic that already matched the allow rule. Additionally, it does not explicitly use User-ID to identify HR users dynamically.
- B
Create a deny rule for the HR user group with application social-media before the allow rule.
Why wrong: This approach places the deny rule with the correct order (before the allow rule). However, it is incorrect because it does not specify the source zone (corporate) and may rely on a static user group rather than dynamic User-ID identification. Without specifying the source zone, the rule could apply to traffic from other zones, potentially blocking unintended traffic, and it may not correctly identify the HR users if they are not part of a static group.
- 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: This approach uses User-ID and correct conditions (source zone corporate, source user HR, application social-media), but places the deny rule after the allow rule. Due to top-down rule evaluation, the allow rule matches first, permitting access to social media for all users including HR, so the deny rule never applies.
- 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 approach correctly uses User-ID to dynamically identify HR users, specifies the source zone corporate and the application social-media, and places the deny rule before the allow rule. This ensures that traffic from HR users to social media is blocked by the deny rule, while all other traffic matches the subsequent allow rule.
How to Block Social Media for HR Using User-ID
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. A key principle to apply: rule Ordering. 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.
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.”
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 it uses User-ID to dynamically identify HR users, specifies the source zone corporate and the application social-media, and places the deny rule before the allow rule. This ensures that traffic from HR users to social media is blocked by the deny rule, while all other traffic matches the subsequent allow rule. Option A is wrong because the allow rule is placed first, so all traffic including HR users to social media will match the allow rule and be permitted, making the deny rule ineffective. Additionally, it does not explicitly use User-ID to identify HR users. Option B places the deny rule before the allow rule (correct order), but it is wrong because it does not specify the source zone (corporate) and may rely on a static user group rather than dynamic User-ID identification. Without the source zone, the rule could apply to traffic from other zones, potentially causing unintended blocking, and it may not correctly identify the HR users. Option C uses User-ID and correct conditions, but places the deny rule after the allow rule. Due to top-down rule evaluation, the allow rule matches first, permitting access to social media for all users, so the deny rule never applies.
Key principle: Rule Ordering
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
This approach fails because the allow rule is placed first, so all traffic, including HR users attempting to access social media, will match the allow rule and be permitted. The subsequent deny rule will never be evaluated for traffic that already matched the allow rule. Additionally, it does not explicitly use User-ID to identify HR users dynamically.
- ✗
Create a deny rule for the HR user group with application social-media before the allow rule.
Why it's wrong here
This approach places the deny rule with the correct order (before the allow rule). However, it is incorrect because it does not specify the source zone (corporate) and may rely on a static user group rather than dynamic User-ID identification. Without specifying the source zone, the rule could apply to traffic from other zones, potentially blocking unintended traffic, and it may not correctly identify the HR users if they are not part of a static group.
- ✗
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
This approach uses User-ID and correct conditions (source zone corporate, source user HR, application social-media), but places the deny rule after the allow rule. Due to top-down rule evaluation, the allow rule matches first, permitting access to social media for all users including HR, so the deny rule never applies.
- ✓
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 approach correctly uses User-ID to dynamically identify HR users, specifies the source zone corporate and the application social-media, and places the deny rule before the allow rule. This ensures that traffic from HR users to social media is blocked by the deny rule, while all other traffic matches the subsequent allow rule.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Rule Ordering
Common exam traps
Common exam trap: answer the scenario, not the keyword
The critical trap is that many candidates place the deny rule after the allow rule, thinking that more specific rules should come first. However, in security policy evaluation, the first match applies. Since the allow rule matches all traffic, any deny rule placed after it will never be evaluated for traffic that matches the allow rule.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Rule Ordering
- User-ID
- Application-Based Rule
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
Rule Ordering
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review rule Ordering, then practise related PCNSA questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Securing Traffic — This question tests Securing Traffic — Rule Ordering.
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 it uses User-ID to dynamically identify HR users, specifies the source zone corporate and the application social-media, and places the deny rule before the allow rule. This ensures that traffic from HR users to social media is blocked by the deny rule, while all other traffic matches the subsequent allow rule. Option A is wrong because the allow rule is placed first, so all traffic including HR users to social media will match the allow rule and be permitted, making the deny rule ineffective. Additionally, it does not explicitly use User-ID to identify HR users. Option B places the deny rule before the allow rule (correct order), but it is wrong because it does not specify the source zone (corporate) and may rely on a static user group rather than dynamic User-ID identification. Without the source zone, the rule could apply to traffic from other zones, potentially causing unintended blocking, and it may not correctly identify the HR users. Option C uses User-ID and correct conditions, but places the deny rule after the allow rule. Due to top-down rule evaluation, the allow rule matches first, permitting access to social media for all users, so the deny rule never applies.
What should I do if I get this PCNSA question wrong?
Review rule Ordering, then practise related PCNSA questions on the same topic to reinforce the concept.
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?
Rule Ordering
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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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