PCNSA App-ID and Content-ID Practice Question
Which of the following is a prerequisite for App-ID to identify applications in encrypted traffic?
⚠ Common exam trap
A common mix-up: candidates assume App-ID can identify all applications purely from metadata or signatures without needing decryption, but the exam tests that SSL decryption is a prerequisite for accurate identification of applications in encrypted traffic.
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
✓
Enable SSL decryption.
App-ID identifies applications by analyzing traffic patterns, including those in encrypted flows. However, to inspect the content of encrypted traffic (e.g., HTTPS), the firewall must first decrypt it using SSL decryption. Without decryption, App-ID can only rely on metadata like IP addresses and ports, which is insufficient for accurate identification of many modern applications that use 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.
- ✗
Configure a custom application signature.
Why it's wrong here
A custom signature identifies bespoke or unknown applications; it does not decrypt TLS, so standard encrypted applications remain opaque. It is the right choice when a proprietary internal application must be detected and controlled by App-ID.
- ✓
Enable SSL decryption.
Why this is correct
App-ID inspects application payloads and TLS handshake metadata, which are opaque inside encrypted sessions. Enabling SSL decryption lets the firewall terminate and inspect traffic, providing the visibility App-ID requires to identify applications. Without decryption, only certificate-based heuristics remain available.
- ✗
Ensure the security rule allows the application.
Why it's wrong here
Allowing the application in the security rule is an enforcement action taken after identification; it performs no decryption, so encrypted traffic stays uninspected. It is correct when the application is already identifiable and you simply need to permit it.
- ✗
Enable App-ID on the security rule.
Why it's wrong here
Enabling App-ID on the security rule controls whether identified applications are permitted; it does not decrypt traffic, so identification inside TLS never occurs. It is the correct step once decryption is already in place and you need to enforce policy on the revealed applications.
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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.