JNCIS-ENT Spanning Tree Practice Question
Which THREE parameters can be configured manually to influence root bridge selection in an RSTP network? (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
✓
Bridge priority increments (multiples of 4096)
Root bridge selection is primarily determined by bridge priority and MAC address. In Junos, administrators configure bridge priority, and can influence port/path costs or use MAC address manipulation indirectly. Specifically, bridge priority is the primary direct control. Let's list valid configuration parameters affecting STP path selection: bridge priority, path cost, and interface cost.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Bridge priority increments (multiples of 4096)
Why this is correct
Priority values are adjusted in multiples of 4096.
- ✓
Interface port cost
Why this is correct
Adjusting port costs influences root path selections.
- ✗
Configuration revision number
Why it's wrong here
Revision numbers are for MSTP region consistency, not RSTP root selection.
- ✓
Bridge priority
Why this is correct
Lowering bridge priority makes a switch more likely to become the root bridge.
- ✗
MST regional configuration name
Why it's wrong here
Region names affect MST grouping, not RSTP root selection.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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.