350-601 Network Practice Question
An engineer is configuring MST on a pair of Cisco Nexus switches that will be part of a vPC domain. The vPC peer-link will carry multiple MST instances. Which MST parameter must be identical on both vPC peers to ensure proper operation?
⚠ Common exam trap
A common mix-up: candidates confuse MST region configuration with other STP parameters like root priority or path cost, assuming any STP-related value must match on both vPC peers, but only the region identity (name, revision, mapping) is critical for MST to function correctly across the peer-link.
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 configuration (name, revision, mapping)
In a vPC domain with MST, both peers must share an identical MST region configuration (name, revision number, and VLAN-to-instance mapping) to ensure they agree on which VLANs belong to which MST instance. Without matching region configurations, the switches would treat each other as being in different MST regions, breaking the common spanning tree topology required for the vPC peer-link to properly carry multiple MST instances.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
PortFast and BPDUguard settings
Why it's wrong here
These are per-port settings, not required to be identical globally.
- ✗
STP root bridge priority
Why it's wrong here
Root bridge priority can differ; it determines root election but not region consistency.
- ✓
MST region configuration (name, revision, mapping)
Why this is correct
These must match for switches to belong to the same MST region.
- ✗
STP path cost for instance 0
Why it's wrong here
Path cost can differ per switch.
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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.