- A
The rule is placed below an earlier rule that also matches the traffic.
Why wrong: This could cause the earlier rule to be matched first, but the question states the traffic is not inspected at all, not that it matches a different rule.
- B
The firewall's license for the threat prevention subscription has expired.
Why wrong: License expiry would affect inspection capabilities, but the firewall would still apply security rules; it would just not perform threat inspection.
- C
The firewall is in an active/passive HA pair and the passive unit is handling traffic.
Why wrong: HA state does not affect rule evaluation; the active unit handles traffic and applies rules.
- D
The rule is disabled in the rulebase.
A disabled rule is not evaluated, so traffic matching that rule will not be inspected.
Quick Answer
The answer is a disabled security policy rule in the rulebase. When a rule is disabled, the firewall completely skips it during traffic evaluation, meaning no inspection, logging, or enforcement occurs for matching traffic, even though the rule appears configured. This explains why the security team sees the rule matching the subnet but observes no inspection or logs—the firewall treats a disabled rule as if it does not exist. On the PCNSA exam, this scenario tests your understanding of rulebase processing order and the critical difference between a rule being present versus being active. A common trap is assuming a configured rule is automatically enforced; the exam often hides a disabled checkbox in the rule properties to test your attention to detail. Memory tip: think of a disabled rule as a “ghost rule”—it’s in the list but has no effect, so traffic passes through unseen.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 team notices that traffic from a specific internal subnet is not being inspected by the firewall. They have configured a security policy rule that matches the subnet and allows the traffic, but the traffic is still not being logged or inspected. 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 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 rule is disabled in the rulebase.
Option D is correct because if a security policy rule is disabled in the rulebase, it will not be evaluated or enforced, even if it matches the traffic. The firewall will skip the rule entirely, meaning no logging or inspection occurs for traffic that would have matched it. This directly explains why the traffic is not being inspected or logged despite the rule appearing to be configured.
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 is placed below an earlier rule that also matches the traffic.
Why it's wrong here
This could cause the earlier rule to be matched first, but the question states the traffic is not inspected at all, not that it matches a different rule.
- ✗
The firewall's license for the threat prevention subscription has expired.
Why it's wrong here
License expiry would affect inspection capabilities, but the firewall would still apply security rules; it would just not perform threat inspection.
- ✗
The firewall is in an active/passive HA pair and the passive unit is handling traffic.
Why it's wrong here
HA state does not affect rule evaluation; the active unit handles traffic and applies rules.
- ✓
The rule is disabled in the rulebase.
Why this is correct
A disabled rule is not evaluated, so traffic matching that rule will not be inspected.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a rule is automatically enforced once created, overlooking the explicit 'enabled' checkbox in the rule configuration, which is a common misconfiguration in real-world deployments.
Detailed technical explanation
How to think about this question
In Palo Alto Networks firewalls, security policy rules are evaluated in order from top to bottom, and only enabled rules are considered during traffic matching. A disabled rule is effectively removed from the rulebase evaluation, so the firewall will not log, inspect, or apply any actions (allow, deny, etc.) for traffic matching that rule. This is a common administrative oversight when rules are created but not activated, often during testing or staging configurations.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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?
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The rule is disabled in the rulebase. — Option D is correct because if a security policy rule is disabled in the rulebase, it will not be evaluated or enforced, even if it matches the traffic. The firewall will skip the rule entirely, meaning no logging or inspection occurs for traffic that would have matched it. This directly explains why the traffic is not being inspected or logged despite the rule appearing to be configured.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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