PCNSA App-ID and Content-ID Practice Question
During an App-ID upgrade, some applications are no longer identified correctly. What is the most likely cause?
⚠ Common exam trap
Palo Alto Networks often tests the misconception that App-ID upgrades only affect built-in applications, leading candidates to overlook the need to migrate custom application signatures, which are not automatically carried over.
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 custom application signatures were not migrated.
During an App-ID upgrade, custom application signatures are stored separately from the built-in application database. If these custom signatures are not migrated to the new version, the firewall will lose the ability to identify those applications, even though the built-in App-ID database is updated. This is the most likely cause because the upgrade process does not automatically preserve user-defined objects.
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 security rules were modified.
Why it's wrong here
Security rules do not affect application identification.
- ✗
The application database was rolled back.
Why it's wrong here
A rollback would revert to previous identification, not cause new issues.
- ✗
The firewall needs a reboot.
Why it's wrong here
Rebooting is rarely required after an upgrade.
- ✓
The custom application signatures were not migrated.
Why this is correct
Custom signatures need to be re-imported or migrated after an upgrade.
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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.