- A
Verify that the multicast group for BUM traffic is reachable.
Why wrong: Multicast group reachability is only required for BUM traffic, not unicast forwarding.
- B
Verify that the NVE interface is configured with the correct source-interface.
The NVE interface must have a valid source-interface to encapsulate VXLAN packets.
- C
Verify that the VXLAN tunnel endpoint IP addresses are in the same subnet.
Why wrong: VTEP IPs can be on different subnets as long as underlay routing exists.
- D
Verify that the VNI is mapped to the correct VLAN on the local VTEP.
The VNI must be associated with the correct VLAN to forward traffic.
- E
Verify that the VXLAN routing table is populated correctly.
Why wrong: VXLAN is a Layer 2 overlay; routing is not directly involved in forwarding within the same VNI.
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshooting a VXLAN network where traffic between two VTEPs in the same VNI is not being forwarded. The underlay network is operational and IP connectivity exists between the VTEPs. Which two actions should the engineer take to verify the VXLAN 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
Verify that the NVE interface is configured with the correct source-interface.
A and B are correct because the NVE interface must have a valid source-interface to encapsulate VXLAN packets, and the VNI must be mapped to the correct VLAN to forward traffic. Option C is incorrect because multicast group reachability is only required for BUM traffic, not unicast. Option D is incorrect because VTEP IPs can be on different subnets. Option E is incorrect because VXLAN is a Layer 2 overlay and does not involve routing.
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.
- ✗
Verify that the multicast group for BUM traffic is reachable.
Why it's wrong here
Multicast group reachability is only required for BUM traffic, not unicast forwarding.
- ✓
Verify that the NVE interface is configured with the correct source-interface.
Why this is correct
The NVE interface must have a valid source-interface to encapsulate VXLAN packets.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Verify that the VXLAN tunnel endpoint IP addresses are in the same subnet.
Why it's wrong here
VTEP IPs can be on different subnets as long as underlay routing exists.
- ✓
Verify that the VNI is mapped to the correct VLAN on the local VTEP.
- ✗
Verify that the VXLAN routing table is populated correctly.
Why it's wrong here
VXLAN is a Layer 2 overlay; routing is not directly involved in forwarding within the same VNI.
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.
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 350-601 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Verify that the NVE interface is configured with the correct source-interface. — A and B are correct because the NVE interface must have a valid source-interface to encapsulate VXLAN packets, and the VNI must be mapped to the correct VLAN to forward traffic. Option C is incorrect because multicast group reachability is only required for BUM traffic, not unicast. Option D is incorrect because VTEP IPs can be on different subnets. Option E is incorrect because VXLAN is a Layer 2 overlay and does not involve routing.
What should I do if I get this 350-601 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 350-601 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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Last reviewed: Jun 24, 2026
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