JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
An engineer is troubleshooting a large-scale enterprise network with multiple MSTP regions connected by a legacy RSTP region. How do boundary switches running MSTP interact with RSTP switches on shared segments?
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
✓
MSTP boundary ports detect RSTP BPDUs and operate in RSTP compatibility mode on that specific port.
MSTP bridge ports connected to RSTP regions automatically downgrade their communication mode to interoperate with RSTP/STP BPDUs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MSTP boundary ports drop all RSTP BPDUs and treat the link as a point-to-point blocked topology.
Why it's wrong here
Boundary ports do not drop BPDUs; they interact by sending MST BPDUs that are understood by RSTP devices as standard BPDUs.
- ✗
The entire MSTP region converts its configuration digest to match the RSTP region's default region name.
Why it's wrong here
Regions do not dynamically alter their internal configuration digests based on external devices.
- ✓
MSTP boundary ports detect RSTP BPDUs and operate in RSTP compatibility mode on that specific port.
Why this is correct
MSTP bridges automatically migrate ports connecting to RSTP/STP regions to legacy mode for compatibility.
- ✗
MSTP isolates the RSTP region into a separate MSTI instance automatically.
Why it's wrong here
MSTI mapping requires manual configuration.
Visual reference
About these practice questions
This JNCIP-ENT question is part of Courseiva's 336-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 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.