Question 636 of 2,015

EtherChannel →mediumMultiple ChoiceObjective-mapped

CCNP EtherChannel Practice Question

This 350-401 practice question tests your understanding of etherchannel. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 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?

Question 1mediummultiple choice

Open the full VLAN trunking answer →

A
Port-channel2 is also trunking but not displayed due to a software bug.
Why wrong: Port-channel2 is configured as access, so it will not appear in trunk output.
B
Port-channel1 is trunking and allowed VLANs include VLANs 101-199.
Why wrong: The allowed VLANs are 1-100 and 200-300, so 101-199 are excluded.
C
Port-channel1 is operational as a trunk with the configured allowed VLANs.
The trunk output confirms the trunk is up and the allowed VLAN list matches.
D
The native VLAN on Po1 is VLAN 10.
Why wrong: The native VLAN is shown as 1, not 10.

Full breakdown with real-world context →

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 output shows that Port-channel1 is configured as a trunk with allowed VLANs 1-100 and 200-300. The 'show interfaces trunk' output confirms that Po1 is trunking and the allowed VLAN list matches. Port-channel2 is not shown in the trunk output, which is expected because it is an access port. The correct answer is that Port-channel1 is operational as a trunk.

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

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 access, so it will not appear in trunk output.
✗
Port-channel1 is trunking and allowed VLANs include VLANs 101-199.
Why it's wrong here
The allowed VLANs are 1-100 and 200-300, so 101-199 are excluded.
✓
Port-channel1 is operational as a trunk with the configured allowed VLANs.
Why this is correct
The trunk output confirms the trunk is up and the allowed VLAN list matches.
Related concept
Access ports place end devices into a single VLAN.
✗
The native VLAN on Po1 is VLAN 10.
Why it's wrong here
The native VLAN is shown as 1, not 10.

Common exam traps

Common exam trap: an active trunk can still block the VLAN you need

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.

Trap categories for this question

Command / output trap
Port-channel2 is configured as access, so it will not appear in trunk output.

Detailed technical explanation

How to think about this question

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.

KKey Concepts to Remember

Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

Use show vlan brief to verify access VLANs.
Use show interfaces trunk to verify trunk state and allowed VLANs.
Do not treat every same-VLAN issue as a routing problem.

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

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.

What to study next

Got this wrong? Here's your next step.

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 350-401 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 350-401 question test?

EtherChannel — This question tests EtherChannel — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: Port-channel1 is operational as a trunk with the configured allowed VLANs. — The output shows that Port-channel1 is configured as a trunk with allowed VLANs 1-100 and 200-300. The 'show interfaces trunk' output confirms that Po1 is trunking and the allowed VLAN list matches. Port-channel2 is not shown in the trunk output, which is expected because it is an access port. The correct answer is that Port-channel1 is operational as a trunk.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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Last reviewed: Jun 18, 2026

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