JNCIS-ENT Layer 2 Security Practice Question
An administrator configures a Layer 2 firewall filter to drop broadcast packets while permitting unicast traffic on an access VLAN. Which THREE configuration elements are required to implement this filter properly? (Choose three)
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
✓
Configure the filter action as 'discard' for the broadcast term.
Implementing this filter requires defining the family ethernet-switching context, writing a term matching broadcast destination MAC addresses with action discard, and applying the filter to the VLAN or interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable active router-advertisement snooping to support the filter.
Why it's wrong here
RA snooping is unrelated to basic Layer 2 MAC filtering.
- ✗
Apply the filter under the 'family inet' routing protocol hierarchy.
Why it's wrong here
Family inet is for Layer 3 IP traffic, not Layer 2 MAC filters.
- ✓
Configure the filter action as 'discard' for the broadcast term.
Why this is correct
The discard action drops the matching broadcast traffic.
- ✓
Define the filter under 'family ethernet-switching'.
Why this is correct
Layer 2 filters require family ethernet-switching.
- ✓
Use a match condition for destination MAC address broadcast 'ff:ff:ff:ff:ff:ff'.
Why this is correct
Matching broadcast frames requires specifying the broadcast destination MAC address.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
About these practice questions
This JNCIS-ENT question is part of Courseiva's 506-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. 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 JNCIS-ENT 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 JNCIS-ENT exam.