- A
PortFast and BPDUguard settings
Why wrong: These are per-port settings, not required to be identical globally.
- B
STP root bridge priority
Why wrong: Root bridge priority can differ; it determines root election but not region consistency.
- C
MST region configuration (name, revision, mapping)
These must match for switches to belong to the same MST region.
- D
STP path cost for instance 0
Why wrong: Path cost can differ per switch.
Question 230 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
STP path cost for instance 0
Why it's wrong here
Path cost can differ per switch.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
MST uses an Internal Spanning Tree (IST) instance (instance 0) to represent the region to the outside world, and all other MST instances (1–4094) are mapped to VLANs via the region configuration. If the region name, revision, or mapping differs, the switches will not recognize each other as part of the same region, causing them to treat the vPC peer-link as a boundary port and potentially blocking traffic or creating loops. In real-world deployments, a mismatch in MST region configuration is a common misconfiguration that leads to unexpected STP topology changes and traffic loss across the vPC domain.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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