JNCIA-SEC Junos OS Security Objects Practice Question
Which Junos OS feature inspects packet headers for layer 3 and layer 4 denial-of-service (DoS) attacks such as SYN floods, IP spoofing, and LAND attacks?
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
✓
SCREEN options
SCREEN options provide attack detection and mitigation for layer 3 and layer 4 DoS attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SCREEN options
Why this is correct
SCREEN options are designed specifically for attack detection and prevention.
- ✗
Firewall filter policers
Why it's wrong here
Policers rate-limit traffic, but SCREEN options provide specialized attack detection profiles.
- ✗
IPsec VPN tunnels
Why it's wrong here
IPsec is used for secure data encryption in transit.
- ✗
Application Layer Gateways (ALGs)
Why it's wrong here
ALGs handle application-level protocol parsing and dynamic port opening.
Visual reference
About these practice questions
One of 513 original JNCIA-SEC practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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.