JNCIA-SEC Junos OS Security Objects Practice Question
An administrator configures a security zone and enables the 'udp-flood' SCREEN option with a specified threshold. How does Junos measure UDP flood attacks for this option?
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
✓
By measuring the rate of incoming UDP packets per second destined for the zone.
The UDP flood SCREEN option monitors the rate of incoming UDP packets per second destined for the zone and triggers when the rate exceeds the configured threshold.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
By measuring the rate of incoming UDP packets per second destined for the zone.
Why this is correct
UDP flood detection evaluates packet arrival rates against configured thresholds.
- ✗
By inspecting UDP payloads for malformed signatures.
Why it's wrong here
Payload inspection is handled by IDP/AppID, not basic UDP flood screen options.
- ✗
By counting the total number of active UDP sessions from all sources combined.
Why it's wrong here
It measures packet arrival rates, not just active session counts.
- ✗
By tracking the duration of UDP flows and flagging long-lived streams.
Why it's wrong here
Long-lived UDP flows are normal for some protocols; flood detection focuses on packet rate.
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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.