JNCIA-SEC Network Address Translation Practice Question
You are troubleshooting a complex Junos NAT implementation involving both Source NAT and Destination NAT across multiple security virtual routers. A packet is received that matches both a Source NAT rule and a Destination NAT rule in different rule-sets. In what order does the Junos flow engine process these NAT types during packet ingestion?
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
✓
Destination NAT is evaluated and applied first, followed by Source NAT, and then Static NAT.
The Junos OS security flow engine evaluates Destination NAT first, followed by Source NAT, and finally Static NAT during packet processing stages.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Destination NAT is evaluated and applied first, followed by Source NAT, and then Static NAT.
Why this is correct
The architectural processing order for NAT in Junos is Destination NAT -> Source NAT -> Static NAT.
- ✗
Source NAT is evaluated first, followed by Destination NAT, and then Static NAT.
Why it's wrong here
Source NAT is evaluated after Destination NAT.
- ✗
Static NAT is evaluated first, followed by Destination NAT, and then Source NAT.
Why it's wrong here
Static NAT is evaluated last.
- ✗
All NAT types are evaluated concurrently in a single hardware pipeline pass.
Why it's wrong here
Junos processes NAT stages sequentially in a defined pipeline order.
Visual reference
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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.