JNCIS-ENT Spanning Tree Practice Question
When a topology change occurs in an RSTP network, how are MAC address forwarding table entries affected across the switches?
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
✓
MAC address table entries associated with non-edge ports are flushed immediately.
Unlike legacy STP, RSTP immediately flushes MAC address entries associated with non-edge ports on receiving a topology change notification, speeding up convergence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MAC addresses are relearned only after the root bridge sends a direct clearing command.
Why it's wrong here
TC flooding mechanisms propagate the notification immediately across designated ports.
- ✗
MAC address entries are retained until the standard 300-second aging timer expires.
Why it's wrong here
RSTP actively flushes tables rather than waiting for the full aging timer.
- ✗
MAC address tables are completely cleared for all ports, including edge ports.
Why it's wrong here
Edge ports do not trigger MAC table flushes when their status changes.
- ✓
MAC address table entries associated with non-edge ports are flushed immediately.
Why this is correct
RSTP flushes dynamic MAC entries to quickly adapt to the new topology without waiting for aging timers.
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
This JNCIS-ENT question is part of Courseiva's 506-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 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.