PCNSA Device Management and Services Practice Question
A security analyst notices that a legitimate application is being incorrectly identified as a different application by the firewall. What is the best first step to resolve this issue?
⚠ Common exam trap
Test-takers frequently think creating a custom App-ID is the quickest fix, but the exam emphasizes that the proper workflow is to first verify the database and report false positives, as custom overrides bypass the automated identification process and can lead to security gaps.
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 the application signature in the App-ID database and submit a false-positive report if needed
The first step in resolving an application misidentification is to verify the application signature in the App-ID database. If the signature is incorrect or missing, submitting a false-positive report allows Palo Alto Networks to update the database, ensuring accurate identification without manual overrides. This aligns with the principle of using the built-in App-ID engine as the primary identification method.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reboot the firewall to refresh the application cache
Why it's wrong here
Rebooting clears runtime state but the App-ID signature or decoder causing the misidentification remains, so the same result recurs once traffic resumes. It is tempting because reboots resolve transient cache or memory faults, which suits intermittent appliance errors rather than deterministic signature mismatches.
- ✗
Disable the application override and use port-based rules
Why it's wrong here
Disabling App-ID and reverting to port-based rules abandons Layer 7 identification entirely, so the misidentification is hidden rather than corrected and policy granularity is lost. It is tempting because port rules are deterministic, which suits environments where application inspection is unavailable.
- ✓
Verify the application signature in the App-ID database and submit a false-positive report if needed
Why this is correct
App-ID misidentification stems from signature or decoder mismatches, so verifying the application signature in the App-ID database confirms whether the firewall's identification is genuinely wrong. Submitting a false-positive report then lets Palo Alto Networks correct the signature, addressing the root cause rather than applying workarounds.
- ✗
Create a custom App-ID to override the incorrect identification
Why it's wrong here
A custom App-ID overrides policy matching for the traffic but does not correct the underlying signature or decoder that misclassifies it, masking the fault. It is tempting because custom App-IDs suit internally developed applications with no existing signature.
Visual reference
Go deeper
Related to this question
About these practice questions
This PCNSA question is part of Courseiva's 385-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.