This 350-601 practice question tests your understanding of 350-601 exam topics. 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.
A data center network uses MST to interoperate with a legacy switch that supports only RSTP. Which MST configuration parameter must match between the MST region and the legacy switch?
Region name
Why wrong: Region name identifies MST region, not needed for RSTP.
Revision number
Why wrong: Revision number is only relevant within MST region.
No parameters need to match; the boundary port runs RSTP.
MST interacts with RSTP via boundary ports using RSTP BPDUs.
VLAN-to-instance mapping
Why wrong: Mapping only matters within MST region; boundary port uses CIST.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
No parameters need to match; the boundary port runs RSTP.
For MST to interoperate with RSTP, the MST region must be configured with the same VLAN-to-instance mapping as the legacy switch's VLAN, but since the legacy switch runs only RSTP, it sees the MST region as a single RSTP bridge. No MST parameter needs to match; the boundary port operates in RSTP mode.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Region name
Why it's wrong here
Region name identifies MST region, not needed for RSTP.
Revision number
Why it's wrong here
Revision number is only relevant within MST region.
No parameters need to match; the boundary port runs RSTP.
VLAN-to-instance mapping
Why it's wrong here
Mapping only matters within MST region; boundary port uses CIST.
Common exam traps
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
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.
What to study next
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
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FAQ
Access ports place end devices into a single VLAN.
The correct answer is: No parameters need to match; the boundary port runs RSTP. — For MST to interoperate with RSTP, the MST region must be configured with the same VLAN-to-instance mapping as the legacy switch's VLAN, but since the legacy switch runs only RSTP, it sees the MST region as a single RSTP bridge. No MST parameter needs to match; the boundary port operates in RSTP mode.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Access ports place end devices into a single VLAN.
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Last reviewed: Jul 4, 2026
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