JNCIS-ENT High Availability Practice Question
Which THREE factors must be considered when configuring a Link Aggregation Group (LAG) with LACP on Junos switches? (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
✓
A minimum number of active links can be configured to ensure traffic drops if bandwidth falls below a threshold.
LAG configuration requires matching speed/duplex, proper device-count definition under chassis, and matching LACP modes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A minimum number of active links can be configured to ensure traffic drops if bandwidth falls below a threshold.
Why this is correct
The 'minimum-links' option drops the aggregated interface if active member count is too low.
- ✗
VRRP must be enabled on every member port for LACP to negotiate successfully.
Why it's wrong here
VRRP is a Layer 3 protocol and is not required for Layer 2 LACP negotiation.
- ✓
All member links must have identical speed, duplex, and LACP active/passive settings.
Why this is correct
Mismatched interface parameters prevent the bundle from forming successfully.
- ✓
Aggregated device counts must be defined under the [edit chassis aggregated-devices ethernet] hierarchy.
Why this is correct
You must allocate 'ae' interfaces at the chassis level before configuring them.
- ✗
GRES must be enabled on all switches participating in a LAG.
Why it's wrong here
GRES is a dual-RE chassis feature, not a requirement for standard LAGs on standalone switches.
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.