JNCIA-SEC Junos OS Security Objects Practice Question
Which Junos OS feature is responsible for translating port numbers for protocols like FTP during transit across security zones?
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 Gateway (ALG)
ALGs handle port translation and protocol parsing for complex applications.
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 Gateway (ALG)
Why this is correct
ALGs parse application data and handle dynamic port mappings.
- ✗
Host-inbound traffic
Why it's wrong here
Host-inbound traffic controls packets destined for the routing engine.
- ✗
SCREEN options
Why it's wrong here
SCREEN options protect against attacks.
- ✗
NAT (Network Address Translation)
Why it's wrong here
While NAT translates IPs and ports, ALGs specifically assist application-level payloads and dynamic control/data channel mapping.
About these practice questions
This JNCIA-SEC question is part of Courseiva's 520-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 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.