350-601 Network Practice Question
An engineer is designing a VXLAN EVPN fabric with multicast-based BUM replication. Which two components are required to support this? (Choose two.)
⚠ Common exam trap
Cisco often tests the distinction between the control plane (BGP EVPN) and the data plane (multicast or ingress replication) for BUM traffic, and the trap here is that candidates mistakenly think BGP EVPN is required for multicast-based replication, when in fact BGP EVPN is for route exchange and the underlay multicast handles the actual packet replication.
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
✓
A multicast group address per VNI
In a VXLAN EVPN fabric using multicast-based BUM replication, each VNI must be mapped to a unique multicast group address in the underlay. This allows the underlay multicast tree to efficiently deliver broadcast, unknown unicast, and multicast traffic to all VTEPs that are members of that VNI, without requiring the ingress VTEP to replicate packets individually.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A multicast group address per VNI
Why this is correct
Multicast group maps to VNI for BUM traffic.
- ✗
NVE interface with multicast group
Why it's wrong here
NVE interface is used, but multicast group is defined per VNI, not NVE.
- ✗
BGP EVPN address family
Why it's wrong here
EVPN is for control plane, not mandatory for multicast underlay.
- ✓
PIM enabled on the underlay
Why this is correct
PIM provides multicast routing.
- ✗
Ingress replication configured
Why it's wrong here
Ingress replication is an alternative, not required.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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