PCNSA Policy Evaluation and Management Practice Question
An administrator is troubleshooting why a security rule that allows traffic from the Trust zone to the DMZ zone is not being hit. The administrator confirms that the source IP, destination IP, and application are correct. Which factor should the administrator check next to determine why the rule is being bypassed?
⚠ Common exam trap
The trap here is forgetting that NAT is evaluated before security policy and can change the zone used for security rule matching.
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
✓
Whether a NAT rule is translating the destination IP and changing the destination zone before security policy evaluation.
NAT rules are processed before security rules. Destination NAT can change the destination IP and therefore the destination zone. If the translated destination falls into a different zone than the one specified in the security rule, the rule will not match. The administrator should examine the NAT policy to see if a rule is altering the destination zone. This is a frequent cause of unexpected rule bypass in Palo Alto Networks firewalls.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Whether the rule is placed below a more general rule that also matches the traffic.
Why it's wrong here
If a more general rule above matches the traffic, the specific rule below would not be hit. However, the administrator is troubleshooting why the specific rule is not hit. While rule order is important, the scenario implies the rule should match based on its criteria. NAT zone translation is a more likely cause because it directly affects the destination zone used in security rule matching.
- ✓
Whether a NAT rule is translating the destination IP and changing the destination zone before security policy evaluation.
Why this is correct
NAT rules are evaluated before security rules, and destination NAT can change the destination zone. If a NAT rule translates the destination IP to an address in a different zone, the security rule's destination zone may no longer match. The administrator should verify NAT rules to ensure the destination zone after NAT matches the security rule's expected zone. This is a common reason for a rule not being hit.
- ✗
Whether the application is identified as a different application due to App-ID signature updates.
Why it's wrong here
App-ID signature updates can change how an application is identified, but the administrator confirmed the application is correct. If the application were misidentified, the rule might not match, but this is less likely than NAT-induced zone changes. App-ID is generally stable, and the scenario suggests the application is already verified. NAT is the next logical check.
- ✗
Whether the security rule has a schedule applied that is currently inactive.
Why it's wrong here
A schedule can prevent a rule from matching if the current time is outside the schedule. However, the scenario does not mention schedules, and the administrator has already confirmed source, destination, and application. While schedules are worth checking, they are less likely than NAT zone changes in this context. The question asks for the next factor to check, and NAT is a more common cause of zone mismatch.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
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.