350-401 Network Assurance Practice Question
A network administrator is troubleshooting a connectivity issue between two switches connected via a trunk link. The trunk is configured with 802.1Q encapsulation. The administrator suspects that the native VLAN is mismatched. Which command displays the native VLAN configuration on a Cisco Catalyst switch?
⚠ Common exam trap
The trap here is thinking show vlan brief shows native VLAN information; it only shows VLAN-to-port assignments for access ports.
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
✓
show interfaces trunk
The show interfaces trunk command is specifically designed to display trunk interface details, including the native VLAN. It provides a concise summary that makes it easy to compare native VLAN settings between switches. While the running configuration also contains the native VLAN setting, show interfaces trunk is the most direct and efficient command for this purpose, especially when checking multiple trunks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show interfaces trunk
Why this is correct
The show interfaces trunk command displays the trunk interfaces, their mode, encapsulation, and the native VLAN. It explicitly lists the native VLAN in the output, allowing the administrator to quickly verify if it matches on both ends. This is the most direct command to check the native VLAN configuration on a trunk port.
- ✗
show running-config interface GigabitEthernet0/1
Why it's wrong here
The show running-config interface command displays the configuration of the interface, including the switchport trunk native vlan command if configured. This can reveal the native VLAN setting, but it only shows the configuration for that specific interface. The show interfaces trunk command provides a more direct and comprehensive view of the native VLAN across all trunk interfaces.
- ✗
show vlan brief
Why it's wrong here
The show vlan brief command lists all VLANs and their assigned ports, but it does not show which VLAN is configured as the native VLAN on a trunk port. It shows access ports and their VLAN assignments, not trunk native VLAN information. This command is not useful for verifying native VLAN mismatch.
- ✗
show spanning-tree interface GigabitEthernet0/1
Why it's wrong here
The show spanning-tree interface command displays spanning-tree information for a specific interface, such as role, state, and cost. It does not show the native VLAN configuration. While spanning-tree can be affected by VLAN mismatches, this command does not directly provide the native VLAN setting.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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