350-601 Network Practice Question
Exhibit
show interface nve 1 nve1 is up Interface-Address: 10.1.1.1/24 NVE Mode: L3VPN Source Interface: loopback0 Number of VNIs: 3 VNI 10010: UP VNI 10020: UP VNI 10030: DOWN show nve vni 10030 VNI 10030 (L3VPN) Associated VLAN: none Operational State: DOWN mcast group: 239.1.1.1
Refer to the exhibit. A VXLAN VNI (10030) is operationally down. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that a VNI goes down due to multicast reachability or source interface issues, but the actual cause is the missing VLAN-to-VNI mapping, which is a common misconfiguration in VXLAN deployments.
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
✓
The VLAN associated with VNI 10030 is not configured or mapped
VXLAN VNI 10030 is operationally down because the VLAN that maps to this VNI is either not created or not associated with the VNI under the NVE interface. In Cisco NX-OS, a VNI becomes operationally up only when the corresponding VLAN exists and is properly mapped via the `member vni 10030 associate-vrf` or `member vni 10030` command under the NVE interface. Without this mapping, the NVE cannot forward traffic for that VNI, leaving it in a down state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The source interface loopback0 is not up
Why it's wrong here
The exhibit shows NVE interface is up, so loopback0 is up.
- ✗
The NVE mode should be L2VPN instead of L3VPN
Why it's wrong here
L3VPN mode is valid; L2VPN would be for bridging; the mode does not cause the VNI to be down.
- ✓
The VLAN associated with VNI 10030 is not configured or mapped
Why this is correct
The VNI must be mapped to a VLAN using 'vn-segment vlan-id' under the VLAN configuration; missing mapping causes operational down.
- ✗
The multicast group 239.1.1.1 is not reachable
Why it's wrong here
If multicast group were unreachable, the VNI might show up but traffic would not forward; the VNI state would still be UP.
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JA
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.