PCNSE Core Concepts and Architecture Practice Question
A security engineer wants to identify applications in SSL/TLS encrypted traffic without decrypting the payload. Which method can be used?
⚠ Common exam trap
Many exam-takers assume application identification in encrypted traffic always requires decryption, overlooking that metadata from the TLS handshake can be used for identification without breaking encryption.
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
✓
Use App-ID's encrypted traffic detection capabilities
App-ID's encrypted traffic detection capabilities allow the firewall to identify applications within SSL/TLS encrypted flows without decrypting the payload. It uses techniques such as server name indication (SNI) inspection, certificate field analysis, and JA3/JA3S fingerprinting to match traffic to known applications, even when the content is encrypted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy a network tap to capture traffic
Why it's wrong here
A tap only copies traffic; it does not identify applications on its own.
- ✓
Use App-ID's encrypted traffic detection capabilities
Why this is correct
App-ID can identify encrypted applications using SNI, IP mapping, and behavioral analysis without decryption.
- ✗
Configure the firewall to trust all certificates
Why it's wrong here
Trusting all certificates does not identify applications and is a security risk.
- ✗
Implement SSL Forward Proxy decryption
Why it's wrong here
SSL Forward Proxy decrypts the traffic, which is not desired for this requirement.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE 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 PCNSE exam.