JNCIS-ENT Spanning Tree Practice Question
Which THREE statements describe the function of the Designated Port in RSTP? (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
✓
It provides the lowest cost path from the segment back toward the root bridge.
A designated port forwards BPDUs onto a segment, provides the lowest cost path to reach the root bridge for that segment, and exists on every segment connected to the bridge where it acts as the forwarding interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It provides the lowest cost path from the segment back toward the root bridge.
Why this is correct
The designated bridge for a segment is responsible for forwarding traffic toward the root.
- ✗
It remains permanently in the discarding state to prevent loops.
Why it's wrong here
Designated ports operate in the forwarding state.
- ✓
It forwards BPDUs onto the attached LAN segment.
Why this is correct
Designated ports send out BPDUs to inform downstream devices.
- ✓
There is exactly one designated port for every active LAN segment.
Why this is correct
Each segment has one designated port connecting it to the spanning tree.
- ✗
It acts as the primary root port for the local bridge.
Why it's wrong here
Root ports and designated ports are distinct roles on different sides of a link.
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.