JNCIS-ENT Layer 2 Security Practice Question
You need to apply a Layer 2 firewall filter named 'block-rogue-mac' to inbound traffic on all access ports of an EX2300 switch. Under which hierarchy level must the filter be bound?
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
✓
set interfaces ge-0/0/0 unit 0 family bridge filter input block-rogue-mac
Layer 2 (bridge) filters in Junos are applied under the VLAN configuration or interface configuration depending on architecture, but for bridge filters inspecting switching interfaces, they are typically applied under 'interfaces <name> unit 0 family bridge filter input'.
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 security firewall filter block-rogue-mac interface ge-0/0/0.0
Why it's wrong here
Layer 2 filters are defined under the top-level 'firewall' statement, not 'security firewall'.
- ✗
set protocols firewall family bridge interface ge-0/0/0.0 input block-rogue-mac
Why it's wrong here
Firewall filters are not configured under protocols.
- ✓
set interfaces ge-0/0/0 unit 0 family bridge filter input block-rogue-mac
Why this is correct
Bridge family filters are bound to interface logical units under the family bridge stanza.
- ✗
set vlans default firewall input block-rogue-mac
Why it's wrong here
Applying bridge filters directly to VLANs uses a different syntax or interface-level binding.
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
Courseiva writes every JNCIS-ENT question from scratch — 506 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.