JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
In a Juniper Virtual Chassis scaling deployment comprising 10 EX4600 switches, how are control and management planes structured across member switches to maintain high availability and failover resilience?
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
✓
Two switches are elected as Master and Backup Routing Engines, while remaining switches act as line cards.
A Virtual Chassis designates a Routing Engine (RE) Master and Backup across designated members, while all switches participate in the distributed forwarding plane.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Two switches are elected as Master and Backup Routing Engines, while remaining switches act as line cards.
Why this is correct
The Virtual Chassis architecture assigns Routing Engine roles to two members for redundancy, with the rest acting as line-card members.
- ✗
Every switch runs its own independent Spanning Tree instance to prevent loops across the virtual backplane.
Why it's wrong here
A Virtual Chassis eliminates internal loops, removing the need for STP across member uplinks.
- ✗
Control traffic is load-balanced across all 10 member switches using ECMP across the dedicated stacking ports.
Why it's wrong here
Control traffic is managed exclusively by the Master Routing Engine.
- ✗
All 10 switches run independent routing engines with separate control planes and synchronized MAC tables.
Why it's wrong here
A Virtual Chassis functions as a single logical switch with a centralized control plane.
About these practice questions
Courseiva writes every JNCIP-ENT question from scratch — 336 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 JNCIP-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 JNCIP-ENT exam.