- A
The Threat Prevention profile is disabled on the rule
Why wrong: The administrator confirmed the profile is applied, so it is not disabled.
- B
An earlier rule with action 'allow' is matching the traffic before reaching this rule
If a higher-priority rule matches and allows traffic without a threat profile, the later rule's profile is not used.
- C
The traffic uses a service that is not supported by the Threat Prevention profile
Why wrong: Threat Prevention profiles inspect all supported protocols; unsupported ones are passed without inspection but this would not affect supported services.
- D
The security rule action is set to 'deny'
Why wrong: If action is deny, the traffic is blocked, not allowed without inspection.
Question 95 of 529
Why Threat Prevention Profile May Not Inspect Traffic: Rule Order Matters
This PCNSA practice question tests your understanding of core concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: security Rule Matching Order. 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.
During a security audit, it is discovered that some traffic from the 'guest' zone to the 'untrust' zone is not being inspected by Threat Prevention profiles. The security rule that matches this traffic has a Threat Prevention profile applied. What is a likely reason for the lack of inspection?
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
✓
An earlier rule with action 'allow' is matching the traffic before reaching this rule
The correct answer is B. In Palo Alto Networks firewalls, security rules are evaluated in order from top to bottom. The first matching rule is applied to the traffic. Even if a later rule has a Threat Prevention profile applied, if an earlier rule with action 'allow' matches and does not have a Threat Prevention profile (or has a different profile), the later rule's profile will not be applied. Thus, traffic may bypass inspection. Option A is incorrect because a disabled profile would cause lack of inspection, but the profile is applied on the rule. Option C is incorrect because Threat Prevention profiles inspect all supported services; unsupported services would be bypassed, but that is not the likely reason here. Option D is incorrect because a 'deny' action would block the traffic, not allow it without inspection.
Key principle: Security Rule Matching Order
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 Threat Prevention profile is disabled on the rule
Why it's wrong here
The administrator confirmed the profile is applied, so it is not disabled.
- ✓
An earlier rule with action 'allow' is matching the traffic before reaching this rule
Why this is correct
If a higher-priority rule matches and allows traffic without a threat profile, the later rule's profile is not used.
Related concept
Security Rule Matching Order
- ✗
The traffic uses a service that is not supported by the Threat Prevention profile
Why it's wrong here
Threat Prevention profiles inspect all supported protocols; unsupported ones are passed without inspection but this would not affect supported services.
- ✗
The security rule action is set to 'deny'
Why it's wrong here
If action is deny, the traffic is blocked, not allowed without inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
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
- Security Rule Matching Order
- Threat Prevention Profile
- Rule Shadowing
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
Security Rule Matching Order
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.
Review security Rule Matching Order, 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?
Core Concepts — This question tests Core Concepts — Security Rule Matching Order.
What is the correct answer to this question?
The correct answer is: An earlier rule with action 'allow' is matching the traffic before reaching this rule — The correct answer is B. In Palo Alto Networks firewalls, security rules are evaluated in order from top to bottom. The first matching rule is applied to the traffic. Even if a later rule has a Threat Prevention profile applied, if an earlier rule with action 'allow' matches and does not have a Threat Prevention profile (or has a different profile), the later rule's profile will not be applied. Thus, traffic may bypass inspection. Option A is incorrect because a disabled profile would cause lack of inspection, but the profile is applied on the rule. Option C is incorrect because Threat Prevention profiles inspect all supported services; unsupported services would be bypassed, but that is not the likely reason here. Option D is incorrect because a 'deny' action would block the traffic, not allow it without inspection.
What should I do if I get this PCNSA question wrong?
Review security Rule Matching Order, then practise related PCNSA questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Security Rule Matching Order
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Last reviewed: Jun 24, 2026
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