JNCIA-SEC Security Policies Practice Question
You are troubleshooting a session-based firewall configuration on an SRX Series device. An application establishes a control connection on one port, but dynamically negotiates a secondary data port for file transfers. Without configuring an explicit policy for the secondary dynamic port, what Junos feature enables the security policy to dynamically permit this secondary data flow?
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
✓
Application Layer Gateways (ALGs)
ALG (Application Layer Gateway) inspects control traffic and dynamically opens sessions for associated data channels, allowing complex applications to function without loose static policies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Application Layer Gateways (ALGs)
Why this is correct
ALGs understand specific protocols and dynamically create temporary session entries for dynamically negotiated ports.
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Unified Security Policy Framework
Why it's wrong here
The unified policy framework integrates threat intelligence and application identification, but dynamic port opening is handled by ALGs.
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Advanced Policy-Based Routing (APBR)
Why it's wrong here
APBR handles path selection based on application signatures, not dynamic port opening.
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Global Policy Fallback
Why it's wrong here
Global policy fallback is not a feature for handling dynamic port negotiation.
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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 Juniper Networks exam blueprint
This JNCIA-SEC practice question is part of Courseiva's free Juniper 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 JNCIA-SEC exam.