- A
A multicast group address per VNI
Multicast group maps to VNI for BUM traffic.
- B
NVE interface with multicast group
Why wrong: NVE interface is used, but multicast group is defined per VNI, not NVE.
- C
BGP EVPN address family
Why wrong: EVPN is for control plane, not mandatory for multicast underlay.
- D
PIM enabled on the underlay
PIM provides multicast routing.
- E
Ingress replication configured
Why wrong: Ingress replication is an alternative, not required.
Question 466 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer is designing a VXLAN EVPN fabric with multicast-based BUM replication. Which two components are required to support this? (Choose two.)
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
Option A is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Ingress replication configured
Why it's wrong here
Ingress replication is an alternative, not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, PIM (Protocol Independent Multicast) must be enabled on the underlay to build the multicast distribution tree (e.g., PIM-SM or PIM-Bidir). Each VTEP uses IGMP to join the multicast group associated with a VNI, and the underlay routers use PIM to forward multicast traffic only to those VTEPs that have joined the group. In a real-world scenario, this approach reduces bandwidth consumption compared to ingress replication, especially in large fabrics with many VTEPs, but requires careful multicast group address planning to avoid overlap across VNIs.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A multicast group address per VNI — Option A is correct because 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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