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
Custom signatures are for non-standard applications, not a prerequisite.
- ✓
Enable SSL decryption.
Why this is correct
SSL decryption is required to inspect encrypted traffic for application identification.
- ✗
Ensure the security rule allows the application.
Why it's wrong here
Allowing the application is a policy action, not a prerequisite for identification.
- ✗
Enable App-ID on the security rule.
Why it's wrong here
App-ID is enabled by default and does not require special enabling on rules.
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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.