Cybersecurity-Practitioner Network Security Practice Question
An administrator is reviewing the Palo Alto Networks firewall traffic logs and sees a session marked with the application 'unknown-tcp'. What does this application classification typically indicate?
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
✓
The firewall detected TCP traffic that does not match any known application signature database entry.
'unknown-tcp' indicates that the firewall recognizes the traffic is TCP-based, but has not matched any known application signature yet (often because it's custom, non-standard, or encrypted/obscured).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The firewall detected TCP traffic that does not match any known application signature database entry.
Why this is correct
'unknown-tcp' means the application signature was not identified during initial packet inspection.
- ✗
The traffic has been blocked by a Security policy rule.
Why it's wrong here
Blocked traffic appears in Threat or Traffic logs with an action of 'deny' or 'drop', not necessarily as an unknown app.
- ✗
The session is an encrypted SSL handshake that failed decryption.
Why it's wrong here
Failed decryption results in decryption error logs or sessions tagged as SSL with inspection errors.
- ✗
The application is a predefined system service running on the management plane.
Why it's wrong here
Management plane traffic is tracked separately and does not appear as data plane 'unknown-tcp'.
About these practice questions
This Cybersecurity-Practitioner question is part of Courseiva's 206-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Palo Alto Networks exam blueprint
This Cybersecurity-Practitioner 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 Cybersecurity-Practitioner exam.