- A
The traffic will be allowed because Rule1 matches before Rule2.
First-match logic: Rule1 matches first, so the action is allow; Rule2 is not evaluated.
- B
To block the traffic, you can set the source zone in Rule2 to 'Negate' Engineering.
Why wrong: There is no 'Negate' option for zones; you must reorder rules or use different criteria.
- C
Moving Rule2 to the end of the rulebase will ensure it blocks the traffic.
Why wrong: Moving Rule2 after Rule3 would still not match if Rule1 allows first; the order among the first two is critical.
- D
The administrator should move Rule2 above Rule1 to block the traffic.
Placing the deny rule before the allow rule ensures the deny matches first.
- E
The firewall evaluates all rules and applies the most restrictive action (deny).
Why wrong: Palo Alto firewalls use first-match, not most restrictive; they stop at the first matching rule.
PCNSA Policy Evaluation and Management Practice Question
This PCNSA practice question tests your understanding of policy evaluation and management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 firewall administrator is troubleshooting a situation where traffic from the 'Engineering' zone (source zone) to the 'Servers' zone (destination zone) is being allowed, but the desired behavior is to block it. The administrator runs 'show running security-policy' and sees the following rules in order: Rule1: from Engineering to Servers allow; Rule2: from Engineering to Servers deny; Rule3: from any to Servers allow. Which TWO statements are true regarding policy evaluation?
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
The traffic will be allowed because Rule1 matches before Rule2.
Option A is correct because Palo Alto Networks firewalls use first-match policy evaluation: the first rule that matches the traffic's source zone, destination zone, source/destination IP, application, and user determines the action. Since Rule1 (allow) appears before Rule2 (deny), traffic from Engineering to Servers matches Rule1 first and is allowed, regardless of later deny rules.
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.
- ✓
The traffic will be allowed because Rule1 matches before Rule2.
Why this is correct
First-match logic: Rule1 matches first, so the action is allow; Rule2 is not evaluated.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
To block the traffic, you can set the source zone in Rule2 to 'Negate' Engineering.
Why it's wrong here
There is no 'Negate' option for zones; you must reorder rules or use different criteria.
- ✗
Moving Rule2 to the end of the rulebase will ensure it blocks the traffic.
Why it's wrong here
Moving Rule2 after Rule3 would still not match if Rule1 allows first; the order among the first two is critical.
- ✓
The administrator should move Rule2 above Rule1 to block the traffic.
Why this is correct
Placing the deny rule before the allow rule ensures the deny matches first.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The firewall evaluates all rules and applies the most restrictive action (deny).
Why it's wrong here
Palo Alto firewalls use first-match, not most restrictive; they stop at the first matching rule.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume firewalls use a 'most restrictive wins' model (like some ACL implementations) rather than the first-match model used by Palo Alto Networks, leading them to incorrectly select Option E.
Detailed technical explanation
How to think about this question
Palo Alto Networks security policy evaluation follows a top-down, first-match model where the firewall stops processing rules as soon as a match is found. This is explicitly documented in the PAN-OS® Administrator’s Guide under 'Policy Evaluation and Ordering'. In a real-world scenario, if an administrator mistakenly places a broad allow rule above a specific deny rule, traffic that should be blocked will be permitted, requiring careful rule ordering or the use of deny rules with higher specificity (e.g., including source/destination IPs) to ensure they match before broader allow rules.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Policy Evaluation and Management — This question tests Policy Evaluation and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The traffic will be allowed because Rule1 matches before Rule2. — Option A is correct because Palo Alto Networks firewalls use first-match policy evaluation: the first rule that matches the traffic's source zone, destination zone, source/destination IP, application, and user determines the action. Since Rule1 (allow) appears before Rule2 (deny), traffic from Engineering to Servers matches Rule1 first and is allowed, regardless of later deny rules.
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.
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Last reviewed: Jun 11, 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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