JNCIA-SEC Network Address Translation Practice Question
An administrator configures Static NAT for an internal server. After committing the configuration, the administrator notices that when external clients initiate connections, the session is created, but outbound traffic from the internal server fails to egress with the static NAT IP. Upon checking rule ordering, a broad Source NAT rule for the entire internal subnet is positioned above the static NAT evaluation stage. How does Junos NAT rule ordering resolve this?
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
✓
Because Source NAT is evaluated before Static NAT, the broad Source NAT rule overrides the static NAT translation for outbound traffic.
Source NAT is evaluated before Static NAT in the Junos NAT processing order. If a Source NAT rule matches the internal host's outbound traffic, the Source NAT translation takes precedence over the static NAT source translation, resulting in incorrect IP translation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Static NAT rule-sets take precedence only if they reside in the same zone as the destination interface.
Why it's wrong here
Evaluation order is fixed by architectural design, not zone location.
- ✓
Because Source NAT is evaluated before Static NAT, the broad Source NAT rule overrides the static NAT translation for outbound traffic.
Why this is correct
Source NAT evaluation precedes Static NAT, meaning general source NAT rules can capture traffic intended for static NAT translation.
- ✗
Static NAT is evaluated before Source NAT, so static NAT always takes precedence.
Why it's wrong here
Static NAT is evaluated last among the NAT types in Junos, after Destination and Source NAT.
- ✗
Source NAT and Static NAT execute in parallel, and Junos randomly selects which translation wins.
Why it's wrong here
Junos evaluation is deterministic and sequential, never random.
Visual reference
About these practice questions
Courseiva writes every JNCIA-SEC question from scratch — 513 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.