PCNSA App-ID and Content-ID Practice Question
A security team notices that custom application 'myapp' is not being identified by App-ID even though the correct application override is in place. What should they verify first?
⚠ Common exam trap
Test-takers frequently assume an application override is a standalone fix that works regardless of the security policy rule's App-ID setting, when in fact the override is only evaluated if the rule has App-ID enabled and the traffic matches that rule.
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
✓
Verify that the traffic reaches the firewall and is allowed by a security policy rule that has App-ID enabled.
App-ID identification occurs after the firewall receives traffic and matches a security policy rule. Even with a correct application override, the traffic must first be allowed by a security policy rule that has App-ID enabled; otherwise, the override is never evaluated. The override only applies to the application identification process, not to the policy enforcement layer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensure the application uses a standard port.
Why it's wrong here
Application overrides match on signature-defined criteria, not port alone, so a standard port does not resolve unidentified custom traffic. Port-based rules belong to legacy firewall policy, where service objects define permitted ports. App-ID requires the custom application's signature to be loaded and its session to traverse a zone where App-ID inspection is enabled.
- ✗
Ensure SSL decryption is enabled for the application.
Why it's wrong here
App-ID identifies applications from the payload, so encrypted traffic prevents signature matching; however, an application override should bypass that identification and force the match, meaning decryption is not the first thing to verify. It is tempting because SSL decryption does enable App-ID visibility generally.
- ✗
Check if the application override is applied to the correct rule.
Why it's wrong here
The stem states the override is already in place, so rechecking rule attachment repeats a verified step. Verifying the override's port and IP definition against the actual traffic is what confirms App-ID matches it, since a mismatch there defeats the override.
- ✓
Verify that the traffic reaches the firewall and is allowed by a security policy rule that has App-ID enabled.
Why this is correct
App-ID requires the session to be permitted by a security policy rule with application identification enabled; otherwise traffic is dropped before inspection. Verifying the packet reaches the firewall and matches such a rule is the prerequisite for any App-ID override to take effect.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.