PCNSA App-ID and Content-ID Practice Question
A network administrator notices that traffic for a custom business application is being incorrectly identified as 'ssl' by the firewall. What is the most efficient way to ensure this application is accurately identified without impacting other SSL traffic?
⚠ Common exam trap
Many exam-takers confuse App-ID override with service definitions or disabling App-ID, thinking that changing port-based classification or updating signatures will fix custom application identification, when in fact only a direct application override provides precise control without collateral impact.
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
✓
Create an App-ID override for the application's specific IP addresses and ports.
An App-ID override allows you to manually assign a specific application signature to traffic matching defined IP addresses and ports, ensuring the custom business application is correctly identified without altering the global App-ID database or affecting other SSL traffic. This is the most efficient method as it directly overrides the incorrect identification at the application level, preserving the integrity of other SSL-based application detection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable App-ID for the security policy rule that allows this traffic.
Why it's wrong here
Disabling App-ID makes the rule match on port and protocol only, so the firewall cannot identify the application at all and other SSL traffic on the same rule loses inspection. It is tempting as a quick workaround for misidentification, and would be valid where no App-ID enforcement is required.
- ✗
Upgrade the App-ID database to the latest version.
Why it's wrong here
The App-ID database already recognises standard SSL; a custom in-house application is not in any vendor signature set, so updating cannot produce a signature for it. Updating is tempting because it resolves stale or missing signatures for known applications, and would be correct if the application were a newly released commercial one.
- ✓
Create an App-ID override for the application's specific IP addresses and ports.
Why this is correct
An App-ID override forces the firewall to classify traffic matching the specified IP addresses and ports as the custom application, bypassing SSL decryption-based identification. Scoping by IP and port leaves all other SSL traffic classified normally.
- ✗
Add the application's TCP port to the service definition in the security policy.
Why it's wrong here
Adding the TCP port to the service definition only narrows port matching; the firewall still classifies the session as ssl because App-ID inspects payload, not the service object. It is tempting because port-based rules are familiar, and would be correct for a non-standard-port application that needs no App-ID classification.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PCNSA question from scratch — 385 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.