Question 135 of 984
350-601 Network Practice Question
A data center engineer is troubleshooting intermittent connectivity between two servers in different VLANs. The servers are connected to different leaf switches in a VXLAN EVPN fabric. When checking the fabric, the engineer notices that the NVE interface on one leaf is up/up but the VNI for the server VLAN is not listed in 'show nve vni'. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the distinction between the NVE interface being operational (up/up) and the VNI being properly instantiated via VLAN-to-VNI mapping, leading candidates to incorrectly suspect BGP or underlay issues when the real problem is a missing local configuration step.
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-to-VNI mapping is missing under the VLAN configuration
The NVE interface being up/up indicates the overlay tunnel is operational, but the absence of the VNI in 'show nve vni' means the VNI is not instantiated on the NVE. This typically occurs when the VLAN-to-VNI mapping is missing under the VLAN configuration (e.g., 'vlan 100' then 'vn-segment 10100'), which prevents the VNI from being associated with the NVE interface and advertised via BGP EVPN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MTU mismatch on the underlay network
Why it's wrong here
MTU mismatch would cause packet drops but not the absence of VNI from 'show nve vni'.
- ✗
Anycast gateway is not configured on the leaf
Why it's wrong here
Anycast gateway is used for first-hop redundancy; its absence does not affect VNI visibility on the NVE.
- ✗
BGP EVPN peers are not established
Why it's wrong here
BGP EVPN peers not established would affect route exchange, but the VNI would still appear in 'show nve vni' if configured.
- ✓
The VLAN-to-VNI mapping is missing under the VLAN configuration
Why this is correct
The VNI must be mapped to a VLAN using 'vn-segment vlan-id' under the VLAN configuration; without it, the VNI does not appear in the NVE interface.
Visual reference
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Last reviewed: Jun 11, 2026
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.
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