- A
VLAN-to-instance mapping is configured using the 'instance' command under MST configuration.
Correct. Example: 'instance 1 vlan 10-20'.
- B
IST (Internal Spanning Tree) instance 0 carries all VLANs not explicitly mapped to an MST instance.
Correct. VLANs not mapped belong to IST (instance 0).
- C
MST supports only a single spanning-tree instance per switch.
Why wrong: MST supports multiple instances (up to 16).
- D
MST BPDUs are sent with a destination MAC address of 01-80-C2-00-00-00.
Why wrong: MST uses the same BPDU MAC as RSTP (01-80-C2-00-00-00).
- E
MST regions must have the same configuration revision number and name to form a region.
Correct. Region consistency requires matching name and revision.
Question 63 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 (Multiple Spanning Tree) on a Nexus switch. Which three statements about MST are correct? (Choose three.)
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
✓
VLAN-to-instance mapping is configured using the 'instance' command under MST configuration.
Option A is correct because the 'instance' command under MST configuration mode (e.g., 'instance 1 vlan 10-20') explicitly maps VLANs to a specific MST instance. Option B is correct: The Internal Spanning Tree (IST), which is instance 0, carries all VLANs that are not explicitly mapped to any other MST instance. Option D is correct: MST BPDUs use the standard spanning-tree destination MAC address 01-80-C2-00-00-00, not the PVST+ MAC. Option C is false because MST supports multiple spanning-tree instances. Option E is false because it only mentions revision number and name; forming an MST region also requires a consistent VLAN-to-instance mapping across all switches.
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.
- ✓
VLAN-to-instance mapping is configured using the 'instance' command under MST configuration.
Why this is correct
Correct. Example: 'instance 1 vlan 10-20'.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
IST (Internal Spanning Tree) instance 0 carries all VLANs not explicitly mapped to an MST instance.
Why this is correct
Correct. VLANs not mapped belong to IST (instance 0).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
MST supports only a single spanning-tree instance per switch.
Why it's wrong here
MST supports multiple instances (up to 16).
- ✗
MST BPDUs are sent with a destination MAC address of 01-80-C2-00-00-00.
- ✓
MST regions must have the same configuration revision number and name to form a region.
Why this is correct
Correct. Region consistency requires matching name and revision.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between MST and PVST+/RSTP, where candidates mistakenly think MST supports only one instance per switch (like legacy STP) or confuse the destination MAC address of MST BPDUs with that of PVST+ BPDUs (01-00-0C-CC-CC-CD).
Detailed technical explanation
How to think about this question
MST (IEEE 802.1s) divides a network into regions, each with its own Internal Spanning Tree (IST) instance 0 that carries all VLANs not explicitly mapped to other MST instances. The IST instance 0 acts as a common spanning tree across regions, while additional MST instances (1-4094) provide per-VLAN load balancing within a region. The configuration revision number and region name must match on all switches in the same MST region to ensure consistent topology.
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
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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: VLAN-to-instance mapping is configured using the 'instance' command under MST configuration. — Option A is correct because the 'instance' command under MST configuration mode (e.g., 'instance 1 vlan 10-20') explicitly maps VLANs to a specific MST instance. Option B is correct: The Internal Spanning Tree (IST), which is instance 0, carries all VLANs that are not explicitly mapped to any other MST instance. Option D is correct: MST BPDUs use the standard spanning-tree destination MAC address 01-80-C2-00-00-00, not the PVST+ MAC. Option C is false because MST supports multiple spanning-tree instances. Option E is false because it only mentions revision number and name; forming an MST region also requires a consistent VLAN-to-instance mapping across all switches.
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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