350-601 Network Practice Question
Which TWO statements are true regarding VXLAN BUM traffic handling? (Choose two.)
⚠ Common exam trap
Cisco often tests the misconception that ingress replication scales better than multicast, but the trap is that ingress replication actually consumes more bandwidth and CPU on the ingress VTEP, making it less scalable in large fabrics compared to multicast-based 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
✓
Ingress replication requires the ingress VTEP to maintain a list of remote VTEPs.
In ingress replication, the ingress VTEP must know all remote VTEPs in the VXLAN segment to unicast-encapsulate and send BUM traffic to each one individually. This list is typically learned via the control plane (e.g., BGP EVPN) or statically configured. Without this list, the ingress VTEP cannot replicate BUM frames to the correct remote destinations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Ingress replication requires the ingress VTEP to maintain a list of remote VTEPs.
Why this is correct
The ingress VTEP replicates to all known remote VTEPs for the VNI.
- ✓
Multicast-based replication requires a multicast routing protocol like PIM in the underlay.
Why this is correct
PIM is needed to route multicast traffic between VTEPs.
- ✗
Ingress replication scales better than multicast in large fabrics.
Why it's wrong here
Multicast scales better; ingress replication creates N copies at the ingress.
- ✗
Multicast-based replication uses IGMP snooping to build replication lists.
Why it's wrong here
Multicast uses PIM, not IGMP snooping, for group membership.
- ✗
Ingress replication is only supported with OSPF underlay.
Why it's wrong here
Ingress replication works with any IP underlay, not just OSPF.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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