JNCIA-SEC Network Address Translation Practice Question
An administrator configures a Source NAT rule with an address pool. When verifying traffic, the administrator notices that multiple distinct internal subnets are matching the rule. How can the administrator restrict the source NAT rule to apply only to a specific subnet while leaving other subnets un-translated?
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
✓
Specify an exact prefix under the rule's 'match source-address' statement.
To restrict a source NAT rule to a specific subnet, the administrator must define a precise 'match source-address <subnet>' statement within the rule configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Specify an exact prefix under the rule's 'match source-address' statement.
Why this is correct
Using a specific source address prefix in the rule match criteria ensures only traffic from that subnet undergoes translation.
- ✗
Apply a firewall filter on the ingress interface to drop un-translated subnets.
Why it's wrong here
Firewall filters drop traffic rather than selectively controlling NAT rule matching.
- ✗
Configure static routes for un-translated subnets pointing to the loopback interface.
Why it's wrong here
Static routes do not control NAT rule matching criteria.
- ✗
Configure the rule-set source zone with individual interface subnets.
Why it's wrong here
Zones group interfaces, not specific subnets for granular rule matching; rule match statements are used for subnet precision.
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.