350-601 Network Practice Question
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?
⚠ Common exam trap
Cisco often tests the misconception that VXLAN requires multicast or that VTEPs must be in the same subnet, but in reality VXLAN operates over a routed underlay and can use unicast or EVPN for BUM traffic.
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.
The NVE interface's source-interface (typically a loopback) defines the local VTEP IP address used for VXLAN encapsulation. If this source-interface is misconfigured or not reachable from the remote VTEP, VXLAN packets will not be sourced from the correct IP, breaking traffic forwarding even when underlay IP connectivity exists.
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.
- ✗
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.
Why this is correct
The VNI must be associated with the correct VLAN to forward traffic.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 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 350-601 exam.