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 security administrator is troubleshooting a policy misconfiguration. The firewall is configured with a security rule that allows traffic from the 'Engineering' zone to the 'Servers' zone. However, traffic from an Engineering user to a server in the 'DMZ' zone is being denied. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rule only allows traffic from Engineering to Servers zone, not DMZ.
The security rule explicitly permits traffic from the 'Engineering' zone to the 'Servers' zone. Traffic destined to the 'DMZ' zone is a different zone, so the rule does not apply. By default, Palo Alto Networks firewalls enforce a deny-all policy for any traffic that does not match an explicit allow rule, which is why the traffic is denied.
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 rule only allows traffic from Engineering to Servers zone, not DMZ.
Why this is correct
The rule explicitly allows Engineering to Servers; traffic to DMZ is not covered and is denied by default.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The rule is configured as an intrazone rule.
Why it's wrong here
An intrazone rule would apply within the same zone, but the traffic is between different zones (Engineering and DMZ).
✗
The rule is disabled in the rulebase.
Why it's wrong here
If disabled, the rule would not appear in the rulebase or would be greyed out; there is no such indication.
✗
SSL decryption is blocking the traffic.
Why it's wrong here
There is no indication of decryption; the issue is policy mismatch.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a rule allowing traffic to one zone implicitly covers all zones, but Palo Alto Networks firewalls require explicit zone matching for each rule, and failing to specify the correct destination zone results in a deny.
Detailed technical explanation
How to think about this question
Palo Alto Networks firewalls use a zone-based security policy model where each rule specifies source and destination zones. Traffic is evaluated against rules in order, and the first matching rule determines the action. If no rule matches, the implicit deny rule drops the packet. In this case, the rule's destination zone is 'Servers', so traffic to 'DMZ' does not match, triggering the implicit deny. This behavior is consistent with RFC 1918 and zone-based firewall design principles.
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.
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 rule only allows traffic from Engineering to Servers zone, not DMZ. — The security rule explicitly permits traffic from the 'Engineering' zone to the 'Servers' zone. Traffic destined to the 'DMZ' zone is a different zone, so the rule does not apply. By default, Palo Alto Networks firewalls enforce a deny-all policy for any traffic that does not match an explicit allow rule, which is why the traffic is denied.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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