JNCIA-SEC Junos OS Security Objects Practice Question
Which statement is true regarding the default security zone behavior in Junos OS?
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
✓
Traffic between different security zones is blocked by default.
By default, traffic between two different security zones is denied unless explicitly permitted by a security policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Traffic between different security zones is permitted by default.
Why it's wrong here
Junos enforces a default-deny policy between security zones.
- ✗
Traffic destined for the routing engine is blocked unless security policies permit it.
Why it's wrong here
Routing engine traffic is governed by host-inbound-traffic settings, not transit security policies.
- ✓
Traffic between different security zones is blocked by default.
Why this is correct
Explicit security policies are required to allow transit traffic between zones.
- ✗
Traffic between interfaces in the same security zone is blocked by default.
Why it's wrong here
Intra-zone traffic (same zone) is permitted by default unless intra-zone blocking is enabled.
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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.