- A
It requires PIM in the underlay to replicate packets.
Why wrong: PIM is needed for multicast-based replication.
- B
The ingress VTEP replicates the BUM packet and sends unicast copies to each remote VTEP.
Correct: ingress replication creates unicast copies.
- C
It reduces replication overhead on the ingress VTEP compared to multicast.
Why wrong: Ingress replication can be more CPU-intensive.
- D
It uses IGMP snooping to optimize replication.
Why wrong: IGMP snooping is for multicast optimization.
Question 80 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.
In a VXLAN EVPN fabric, BUM traffic can be handled by ingress replication or multicast. Which statement about ingress replication is accurate?
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 ingress VTEP replicates the BUM packet and sends unicast copies to each remote VTEP.
In ingress replication, the ingress VTEP (VXLAN Tunnel Endpoint) receives a BUM (Broadcast, Unknown unicast, Multicast) packet and creates multiple unicast-encapsulated copies, sending one copy to each remote VTEP in the same VXLAN network identifier (VNI) segment. This method does not rely on any multicast protocol in the underlay; instead, it leverages the VTEP's knowledge of all remote VTEPs (typically learned via the EVPN control plane, such as Type 3 Inclusive Multicast Ethernet Tag routes) to replicate traffic. Option B correctly describes this behavior.
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.
- ✗
It requires PIM in the underlay to replicate packets.
Why it's wrong here
PIM is needed for multicast-based replication.
- ✓
The ingress VTEP replicates the BUM packet and sends unicast copies to each remote VTEP.
Why this is correct
Correct: ingress replication creates unicast copies.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It reduces replication overhead on the ingress VTEP compared to multicast.
Why it's wrong here
Ingress replication can be more CPU-intensive.
- ✗
It uses IGMP snooping to optimize replication.
Why it's wrong here
IGMP snooping is for multicast optimization.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that ingress replication requires an underlay multicast protocol like PIM or IGMP, when in fact it is a unicast-based replication method that avoids any multicast dependency in the underlay.
Detailed technical explanation
How to think about this question
Ingress replication is defined in RFC 7348 and is the default BUM handling method in many VXLAN EVPN deployments when multicast is not configured in the underlay. The ingress VTEP maintains a list of remote VTEPs for each VNI, populated via BGP EVPN Type 3 routes, and replicates each BUM packet per remote VTEP, which can lead to significant CPU and bandwidth overhead on the ingress VTEP in large fabrics. In contrast, multicast-based replication uses an underlay multicast group (e.g., (S,G) or (*,G)) to deliver a single copy to the network, relying on PIM to replicate at intermediate routers, reducing the ingress VTEP's load.
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: The ingress VTEP replicates the BUM packet and sends unicast copies to each remote VTEP. — In ingress replication, the ingress VTEP (VXLAN Tunnel Endpoint) receives a BUM (Broadcast, Unknown unicast, Multicast) packet and creates multiple unicast-encapsulated copies, sending one copy to each remote VTEP in the same VXLAN network identifier (VNI) segment. This method does not rely on any multicast protocol in the underlay; instead, it leverages the VTEP's knowledge of all remote VTEPs (typically learned via the EVPN control plane, such as Type 3 Inclusive Multicast Ethernet Tag routes) to replicate traffic. Option B correctly describes this behavior.
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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