JNCIS-ENT High Availability Practice Question
You are troubleshooting a VRRP deployment where two EX4600 switches are acting as redundant gateways for several VLANs. Clients on VLAN 10 report intermittent gateway unreachability. You notice that VRRP mastership frequently flips between Switch A and Switch B. What is the most effective way to stabilize VRRP mastership?
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
✓
Review interface error counters, ensure physical link stability, and increase the VRRP advertisement interval if transient congestion is dropping packets.
Frequent mastership flipping (flapping) is typically caused by missing advertisements due to interface drops, high CPU, or mismatched timers. Increasing advertisement intervals or tuning timers resolves this.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure all member ports in the LAG to use static mode.
Why it's wrong here
LAG configuration does not govern VRRP mastership stability.
- ✓
Review interface error counters, ensure physical link stability, and increase the VRRP advertisement interval if transient congestion is dropping packets.
Why this is correct
Stabilizing physical links and tuning advertisement intervals prevents backup routers from assuming the master role due to missed heartbeat advertisements.
- ✗
Disable Virtual Chassis on both switches.
Why it's wrong here
If switches are standalone or in VC, VRRP operates independently per VLAN interface.
- ✗
Remove GRES from the routing engine configuration.
Why it's wrong here
GRES operates at the chassis level and does not cause VRRP router mastership flapping between two separate physical switches.
Visual reference
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.