JNCIA-SEC Network Address Translation Practice Question
You configure a Static NAT mapping for a server. External users report that they can connect to the server, but internal users on the trust zone trying to reach the server via the same static NAT public IP experience connection timeouts. You have already verified that interface routing is correct. What specific Junos feature can be enabled to solve this internal reachability issue without changing internal DNS records?
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
✓
Configure a Source NAT rule for traffic originating from the internal zone destined to the internal zone matching the static NAT IP.
Enabling source NAT for local traffic (Hairpin NAT / NAT loopback) allows internal clients to connect to internal servers using public IPs by translating the internal source IP so the server replies through the SRX.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a Static NAT rule with the 'off-path' option enabled.
Why it's wrong here
There is no 'off-path' option in Junos Static NAT configurations.
- ✗
Change the security policy action to 'permit' with 'nat source interface' embedded.
Why it's wrong here
NAT actions cannot be embedded directly inside security policy action statements in this manner; NAT is configured in the nat hierarchy.
- ✓
Configure a Source NAT rule for traffic originating from the internal zone destined to the internal zone matching the static NAT IP.
Why this is correct
This specific intra-zone or inter-zone source NAT configuration handles hairpin NAT scenarios for static and destination NAT.
- ✗
Enable 'proxy-arp' on the internal interface facing the trusted network hosts.
Why it's wrong here
Proxy ARP is used for external interfaces responding to upstream routers, not internal clients.
Visual reference
About these practice questions
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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.