JNCIA-SEC Junos OS Security Objects Practice Question
You want to apply a SCREEN option to protect against ICMP ping floods across all interfaces in a specific security zone. How should you structure this in the CLI?
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
✓
Create a screen profile with ICMP flood parameters and apply that profile under the security zone configuration.
ICMP flood protection is configured inside a screen profile under [edit security screen], and that profile is then applied to the security zone.
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 [edit security zones security-zone trust screen icmp-flood threshold 1000] directly.
Why it's wrong here
Screen profiles must be created first under [edit security screen] and then referenced in the zone.
- ✗
Enable ICMP inspection inside the junos-icmp application definition.
Why it's wrong here
Applications do not configure attack mitigation thresholds.
- ✓
Create a screen profile with ICMP flood parameters and apply that profile under the security zone configuration.
Why this is correct
Profiles are defined globally under screen and referenced under zones.
- ✗
Apply ICMP flood options directly under the [edit security policies] hierarchy.
Why it's wrong here
Policies do not house SCREEN attack detection options.
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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.