PCNSE Manage, Monitor and Operate Practice Question
An engineer is troubleshooting a security policy that is not matching traffic as expected. The traffic is from source IP 10.1.1.10 to destination 172.16.0.1 port 443. The policy has source zone 'Internal', destination zone 'DMZ', source address '10.1.1.0/24', destination address '172.16.0.0/24', application 'ssl'. The firewall shows the traffic hitting a different rule. What is the most likely cause?
⚠ Common exam trap
Palo Alto Networks often tests the misconception that application signatures are version-specific (e.g., TLS 1.3 vs. SSL), but Palo Alto Networks uses generic application signatures that match all versions of a protocol, so candidates incorrectly eliminate the correct answer due to a misunderstanding of application identification.
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 is being matched by an earlier rule with broader criteria.
The most likely cause is that an earlier rule in the security policy rulebase matches the traffic before the intended rule. Palo Alto Networks firewalls evaluate security rules in sequential order from top to bottom, and the first rule that matches all criteria (source/destination zone, source/destination address, application, etc.) is applied. If a rule with broader criteria (e.g., any/any or a less specific application) appears earlier, it will match the traffic, preventing the intended rule from being hit.
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 source zone is incorrectly assigned; traffic is coming from a different zone.
Why it's wrong here
If the zone were wrong, the traffic would not match the rule at all; but it hits a different rule, so zone is likely correct for that other rule.
- ✗
The destination address is not in the specified subnet due to NAT.
Why it's wrong here
If NAT is applied, the rule should use the pre-NAT or post-NAT address depending on configuration; but if the rule is for the DMZ zone, it should match the original destination before NAT.
- ✗
The application 'ssl' does not match because the traffic is actually using TLS 1.3.
Why it's wrong here
The ssl application identifier covers all SSL/TLS versions, including TLS 1.3.
- ✓
The traffic is being matched by an earlier rule with broader criteria.
Why this is correct
Rule order matters; a prior rule with broader source/destination/application may match before the intended rule.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE 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 PCNSE exam.