PCNSA App-ID and Content-ID Practice Question
An administrator configures a custom App-ID signature using a packet buffer override. What is the implication?
⚠ Common exam trap
The trap here is that candidates mistakenly think a packet buffer override only affects port-based matching or that custom signatures are always subordinate to built-in signatures, when in fact the override explicitly gives the custom signature priority.
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 firewall will use the custom signature instead of the default.
When a custom App-ID signature is configured with a packet buffer override, the firewall is instructed to use the custom signature's definition to identify the application instead of relying on the default built-in App-ID signature. This override ensures that the custom signature takes precedence over any existing default signature for the same application, allowing the administrator to enforce a specific application identification behavior.
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 custom signature will only match on specific ports.
Why it's wrong here
Overrides are not limited by port; they match on packet content.
- ✗
The custom signature will be ignored if it conflicts with built-in.
Why it's wrong here
Overrides are intended to be used in place of built-in signatures.
- ✗
The custom signature requires a separate license.
Why it's wrong here
No additional license is needed for custom App-ID signatures.
- ✓
The firewall will use the custom signature instead of the default.
Why this is correct
Packet buffer override replaces the built-in signature for that application.
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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.