JNCIS-ENT Layer 2 Switching And VLANs Practice Question
You are configuring multiple VLANs on an EX Series switch and wish to set the aging time for learned MAC addresses to 600 seconds. Where is this parameter configured?
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
✓
[edit ethernet-switching-options mac-table aging-time 600]
MAC table aging time in Junos is configured under the [edit bridge-options] or [edit ethernet-switching-options] hierarchy depending on the platform.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
[edit vlans default ageing-timer 600]
Why it's wrong here
Ageing timer is not configured per-VLAN under the [edit vlans] hierarchy.
- ✗
[edit protocols l2-learning aging-time 600]
Why it's wrong here
L2-learning parameters are configured under switching options, not standard routing protocols.
- ✗
[edit system mac-address-table aging-time 600]
Why it's wrong here
The system hierarchy does not contain Layer 2 switching table timers.
- ✓
[edit ethernet-switching-options mac-table aging-time 600]
Why this is correct
Correct. Ethernet-switching options govern MAC table aging behavior globally on EX switches.
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.