This 350-401 practice question tests your understanding of netflow and telemetry. 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 SW1:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VLANs 10 and 20 are configured and have ports assigned
The output shows VLANs configured on the switch. VLANs 1, 10, and 20 are active and have ports assigned. VLANs 1002-1005 are default VLANs that are not supported on this platform (act/unsup). The correct answer is that VLANs 10 and 20 are configured and have ports assigned.
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.
✓
VLANs 10 and 20 are configured and have ports assigned
Why this is correct
The output shows VLANs 10 and 20 with status 'active' and ports assigned (Gi0/4, Gi0/5 for VLAN 10; Gi0/6, Gi0/7 for VLAN 20).
Related concept
Access ports place end devices into a single VLAN.
✗
All VLANs are in the active state and supported
Why it's wrong here
VLANs 1002-1005 are in 'act/unsup' state, meaning they are not supported on this platform.
✗
VLAN 1 is the only VLAN with ports assigned
Why it's wrong here
VLAN 1 has ports Gi0/1, Gi0/2, Gi0/3 assigned, but VLANs 10 and 20 also have ports assigned.
✗
The switch is running VTP transparent mode
Why it's wrong here
The output does not provide any information about VTP mode.
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
The output does not provide any information about VTP mode.
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.
NetFlow and Telemetry — This question tests NetFlow and Telemetry — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: VLANs 10 and 20 are configured and have ports assigned — The output shows VLANs configured on the switch. VLANs 1, 10, and 20 are active and have ports assigned. VLANs 1002-1005 are default VLANs that are not supported on this platform (act/unsup). The correct answer is that VLANs 10 and 20 are configured and have ports assigned.
What should I do if I get this 350-401 question wrong?
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.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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