350-401 Virtualization Practice Question
A network engineer is configuring a Cisco Nexus 9000 switch as a VXLAN Tunnel Endpoint. The engineer needs to define the source interface used for the VXLAN tunnels and map VLANs to a VNI. Which command sequence accomplishes this?
⚠ Common exam trap
The trap here is mixing up the placement of the VLAN-to-VNI mapping, which belongs under the VLAN interface as vn-segment, not under the NVE interface or the VNI member 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
✓
feature nv overlay, interface nve1, source-interface loopback1, member vni 10000, then under interface Vlan100 configure vn-segment 10000
On Nexus 9000 NX-OS, VXLAN configuration requires enabling the NV overlay feature, creating interface nve1, specifying the loopback as the tunnel source, adding the VNI as a member, and mapping the VLAN to the VNI with vn-segment under the VLAN interface. The other options misplace commands or use syntax from other platforms.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
interface nve1, then source-interface loopback1, then member vni 10000 associated-vrf tenant1
Why it's wrong here
The member vni command with associated-vrf maps a VNI to a VRF for Layer 3 VNI operation, not to a VLAN for Layer 2 bridging. The scenario requires mapping VLANs to a VNI for Layer 2 extension. Using associated-vrf would create a Layer 3 VNI, which serves inter-subnet routing rather than the VLAN-to-VNI mapping the engineer needs.
- ✗
interface nve1, then source-interface loopback1, then member vni 10000, then vlan 100 under the VNI
Why it's wrong here
While the source-interface and member vni portions are correct, the VLAN mapping is not configured by placing a vlan command under the VNI. Instead, the VLAN is mapped to the VNI under the VLAN interface configuration using vn-segment. The order and placement of commands matter, and this option misplaces the VLAN association, so the mapping would not take effect.
- ✓
feature nv overlay, interface nve1, source-interface loopback1, member vni 10000, then under interface Vlan100 configure vn-segment 10000
Why this is correct
This sequence enables the NV overlay feature, creates the NVE interface, sets the loopback as the tunnel source, adds the VNI as a member, and maps VLAN 100 to VNI 10000 using vn-segment under the SVI. This is the correct Nexus 9000 method for defining a VTEP and binding a VLAN to a VNI for Layer 2 VXLAN bridging. All required elements are present and correctly placed.
- ✗
interface vxlan1, then source-interface loopback1, then vni 10000 vlan 100 mapping
Why it's wrong here
The interface name vxlan1 and the vni vlan mapping syntax belong to other platforms, not to Cisco Nexus 9000 NX-OS, which uses the nve1 interface. Using the wrong interface name and syntax would fail on a Nexus switch. The scenario specifies a Nexus 9000, so the correct commands must follow NX-OS conventions with feature nv overlay and interface nve1.
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SDN Controllers and Cisco ACI
Key term
Cisco Virtual Topology System
Cisco Virtual Topology System is a software-defined networking solution that creates and manages virtual network overlays across physical and virtual infrastructure for enterprise networks.
Key term
VXLAN
VXLAN is a network overlay technology that encapsulates Layer 2 Ethernet frames in UDP packets to extend VLANs across Layer 3 networks.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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