JNCIS-ENT Spanning Tree Practice Question
An administrator configures link aggregation (ae0) using LACP between two EX Series switches running RSTP. How does RSTP treat the aggregated interface ae0?
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
✓
RSTP treats the aggregate interface as a single logical port.
RSTP treats an aggregated Ethernet bundle (LACP) as a single logical port, running spanning tree calculations on the bundle rather than individual physical member links.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RSTP places all member links except the primary active link into a permanent discarding state.
Why it's wrong here
LACP manages member link forwarding; RSTP treats the bundle as a single unit.
- ✗
RSTP disables itself on aggregated links to prevent conflicts with LACP.
Why it's wrong here
Spanning tree remains active on the aggregated logical interface.
- ✓
RSTP treats the aggregate interface as a single logical port.
Why this is correct
LACP aggregation hides individual physical links from RSTP, which treats ae0 as a single port.
- ✗
RSTP runs an independent spanning tree instance on each physical member link of the aggregate.
Why it's wrong here
Spanning tree runs on the logical interface, not individual physical members.
Visual reference
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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.