350-601 Network Practice Question
A data center network uses MST with multiple instances. Different VLANs are mapped to different MST instances to utilize multiple spanning tree paths. Which MST parameter must be identical on all switches in the same region to ensure proper operation?
⚠ Common exam trap
Cisco often tests the misconception that any consistent STP parameter (like bridge priority or timers) is sufficient for MST region formation, but the trap is that only the region name, revision number, and VLAN-to-instance mapping must match—other parameters like timers or priorities are per-instance or per-switch and do not affect region membership.
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
✓
MST region name and revision number
In MST, all switches within the same region must agree on the region name and revision number to form a consistent MST region. If these parameters differ, switches will treat each other as being in different regions, causing the MST instances to be recalculated as separate CST (Common Spanning Tree) regions, which can lead to suboptimal or broken load balancing across VLANs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
MST region name and revision number
Why this is correct
Correct: region name and revision must match for region consistency.
- ✗
Port path cost
Why it's wrong here
Port cost can vary per switch.
- ✗
Bridge priority
Why it's wrong here
Bridge priority can differ per switch; root selection still works.
- ✗
Max age timer
Why it's wrong here
Timer values can differ, but may cause issues; not required identical.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco 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 350-601 exam.