JNCIA-SEC Junos OS Security Objects Practice Question
An administrator configures a security zone and enables the 'icmp all' SCREEN option with threshold parameters. What does the 'icmp all' option encompass?
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
✓
It monitors and limits the aggregate rate of all ICMP packet types combined.
The 'icmp all' SCREEN option applies flood protection and threshold monitoring across all ICMP types collectively.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It blocks ICMP echo requests while allowing ICMP destination unreachable messages.
Why it's wrong here
Specific ICMP type filtering is handled by individual icmp options, whereas 'icmp all' covers all types.
- ✗
It inspects ICMP payloads for encapsulated malicious shellcode.
Why it's wrong here
Payload inspection requires IDP/AppSecure, not basic SCREEN options.
- ✓
It monitors and limits the aggregate rate of all ICMP packet types combined.
Why this is correct
'icmp all' applies flood detection to all incoming ICMP traffic collectively rather than individual types.
- ✗
It drops all ICMP packets unconditionally without exception.
Why it's wrong here
It enforces rate thresholds, it does not drop all ICMP blindly unless thresholds are exceeded.
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.