PCNSA App-ID and Content-ID Practice Question
Which TWO methods can be used to create a custom App-ID signature?
⚠ Common exam trap
Many exam-takers confuse port-based identification with App-ID, thinking a port match can define a custom application, but App-ID is designed to identify applications by their behavior and content, not by port number.
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
✓
Using a packet buffer override.
A packet buffer override is a method used to create a custom App-ID signature by capturing and analyzing the payload of a specific application's traffic. This allows the firewall to identify the application based on unique byte sequences or patterns in the packet payload, which is essential for applications that use non-standard ports or encryption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using a Data Filtering profile.
Why it's wrong here
Data Filtering is for content inspection, not application identification.
- ✓
Using a packet buffer override.
Why this is correct
Packet buffer override lets you define custom content to identify an application.
- ✗
Using a URL Filtering profile.
Why it's wrong here
URL Filtering is for content categorization, not application identification.
- ✓
Using a custom application signature with an attribute filter.
Why this is correct
Attribute filters define custom signatures based on protocol attributes.
- ✗
Using a custom application signature with a port match.
Why it's wrong here
Port matching is part of service definitions, not custom App-ID signatures.
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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.