350-601 Network Practice Question
Exhibit
interface nve1 no shutdown source-interface loopback0 member vni 10000 associate-vrf TenantA
Refer to the exhibit. A network engineer notices that the NVE1 interface is up but VXLAN traffic is not being encapsulated. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that an NVE interface being up means VXLAN encapsulation is fully functional, but the control plane (BGP EVPN) must be active to provide the necessary remote VTEP information.
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 BGP EVPN address-family is not activated.
VXLAN traffic encapsulation on the NVE1 interface requires the BGP EVPN address-family to be activated under the BGP configuration to exchange VNI-to-VTEP mappings. Without this address-family, the NVE interface cannot learn remote VTEPs, so VXLAN packets are never encapsulated with the outer UDP/IP header.
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 VNI 10000 is not mapped to a VLAN.
Why it's wrong here
The VNI is mapped to a VRF (associate-vrf), which is sufficient for Layer 3 VXLAN; no VLAN mapping is required for L3 VNI.
- ✗
The ingress replication protocol must be static.
Why it's wrong here
Ingress replication can be configured with BGP or static; BGP is valid, so this is not the issue.
- ✗
The loopback0 interface is not configured.
Why it's wrong here
The source-interface is configured, so loopback0 must exist; otherwise the NVE would not come up.
- ✓
The BGP EVPN address-family is not activated.
Why this is correct
EVPN requires MP-BGP with the l2vpn evpn address-family to exchange routes; without it, VXLAN encapsulation cannot function.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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