350-601 Network Practice Question
Which MST configuration parameter must match across all switches in the same MST region?
⚠ Common exam trap
Cisco often tests the misconception that bridge priority or root bridge must match across a region, but the trap here is that only the three region parameters (name, revision, VLAN mapping) must be identical; other spanning-tree parameters are per-instance or per-switch and do not define 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
✓
Region name, revision, and VLAN mapping
In MST (Multiple Spanning Tree) protocol, switches in the same MST region must share the same region name, revision number, and VLAN-to-instance mapping. These parameters define the region boundary; if any differ, switches will treat each other as being in different regions, breaking MST interoperability and causing them to run separate spanning trees (e.g., PVST+).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Port cost
Why it's wrong here
Can be different per switch.
- ✗
Root bridge
Why it's wrong here
Root is elected, not a configuration.
- ✓
Region name, revision, and VLAN mapping
Why this is correct
These define the MST region.
- ✗
Bridge priority
Why it's wrong here
Can differ per switch.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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