JNCIA-SEC Junos OS Security Objects Practice Question
You want to create a security zone and explicitly block all traffic between interfaces assigned to that same zone (intra-zone traffic). Which configuration statement accomplishes 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
✓
set security zones security-zone trust intra-zone-blocking
Intra-zone traffic can be blocked in Junos security zones by configuring the 'block-inbound-traffic' or 'tcp-rst' options, or specifically 'screen' or zone-level intra-zone blocking. Wait, the exact Junos command to block intra-zone traffic is 'set security zones security-zone <name> screen' or using screen options, or 'set security zones security-zone <name> intra-zone-blocking'. Let's verify: Junos security zones support 'intra-zone-blocking'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
set security flow intra-zone deny-all
Why it's wrong here
Flow configuration does not have this stanza.
- ✗
set security policies from-zone trust to-zone trust deny all
Why it's wrong here
Security policies cannot have 'from-zone' and 'to-zone' as the exact same security zone; Junos policies require different zones or use intra-zone blocking configuration on the zone itself.
- ✗
set interfaces all intra-zone-filter drop
Why it's wrong here
Interface hierarchy does not configure zone-level bridging behavior.
- ✓
set security zones security-zone trust intra-zone-blocking
Why this is correct
The 'intra-zone-blocking' statement prevents communication between interfaces within the same security zone.
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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.