mediumMultiple Choice
350-401 Practice Question: Runs the following command on Switch SW5: SW5#…
A network engineer runs the following command on Switch SW5:
SW5# show running-config | section interface port-channel interface Port-channel1 switchport mode trunk switchport trunk allowed vlan 1-100,200-300
!
interface Port-channel2 switchport mode access switchport access vlan 10
!
SW5# show interfaces trunk
Port Mode Encapsulation Status Native vlan Po1 on 802.1q trunking 1
Port Vlans allowed on trunk Po1 1-100,200-300
Port Vlans allowed and active in management domain Po1 1-100,200-300
Port Vlans in spanning tree forwarding state and not pruned Po1 1-100,200-300
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between trunk and access port behavior, and the trap here is assuming that a port-channel with an access configuration will still appear in trunk output or that the native VLAN can be inferred from the access VLAN configuration.
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
✓
Port-channel1 is operational as a trunk with the configured allowed VLANs.
The 'show interfaces trunk' output confirms that Port-channel1 is trunking with an operational status of 'trunking', and the 'Vlans allowed on trunk' line matches the configured allowed VLANs (1-100,200-300). This indicates the trunk is up and functioning with the intended VLAN list, making option C correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Port-channel2 is also trunking but not displayed due to a software bug.
Why it's wrong here
Port-channel2 is configured as an access port, not a trunk, so it is intentionally omitted from the 'show interfaces trunk' output. The command only displays interfaces operating in trunking mode, and there is no software bug that would hide a trunk. Therefore, the absence of Port-channel2 from the output is accurate and does not indicate a hidden trunking interface.
- ✗
Port-channel1 is trunking and allowed VLANs include VLANs 101-199.
Why it's wrong here
The allowed VLAN list for Port-channel1 explicitly includes VLANs 1 through 100 and VLANs 200 through 300, which means VLANs 101 through 199 are pruned and not forwarded across the trunk. Claiming that VLANs 101-199 are included is factually incorrect. The output unambiguously shows that these VLANs are excluded from the trunk's allowed VLAN list, so this answer misreads the displayed range.
- ✓
Port-channel1 is operational as a trunk with the configured allowed VLANs.
Why this is correct
The output confirms Port-channel1 is in trunking mode, is operationally up, and its allowed VLAN list matches the configured VLANs of 1-100 and 200-300. The 'show interfaces trunk' command verifies that the port-channel is carrying traffic for the exact set of VLANs that were configured, with no unexpected additions or removals. This matches the correct operational state expected for a properly configured EtherChannel trunk.
- ✗
The native VLAN on Po1 is VLAN 10.
Why it's wrong here
The native VLAN displayed for Port-channel1 is VLAN 1, which is the default native VLAN on Cisco switches, not VLAN 10. The 'show interfaces trunk' output clearly lists 'Native VLAN: 1' for Port-channel1, so any assertion that it is VLAN 10 is incorrect. This option likely confuses the native VLAN with the access VLAN of a different interface or a misremembered configuration value.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.