JNCIA-SEC Security Policies Practice Question
When configuring a zone-based security policy in Junos, what is the default action applied to any traffic that does not match any explicitly defined security policy rules?
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
✓
Deny (Drop)
Junos OS implements an implicit deny policy by default, meaning any traffic not explicitly permitted by a security policy is dropped.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reject
Why it's wrong here
Reject sends an ICMP unreachable message back, whereas the default drop is silent unless configured otherwise.
- ✗
Permit
Why it's wrong here
Traffic is never permitted by default; an explicit policy is required.
- ✗
Log only
Why it's wrong here
Traffic matching no rules is silently dropped, not logged by default.
- ✓
Deny (Drop)
Why this is correct
Junos OS uses an implicit deny action for all traffic matching no explicit rules.
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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.