- A
Multicast in the underlay is always required for BUM traffic
Why wrong: Ingress replication works without underlay multicast.
- B
Ingress replication sends a copy of the BUM packet to each remote VTEP via unicast
Ingress replication encapsulates each copy as unicast.
- C
Ingress replication consumes more bandwidth on the source VTEP uplinks than multicast
Multiple copies consume more bandwidth.
- D
Only the ingress VTEP handles BUM traffic
Why wrong: Egress VTEPs also handle BUM forwarding to local endpoints.
- E
BUM traffic is never flooded to all VTEPs
Why wrong: BUM is flooded to all VTEPs in the same VNI.
Question 86 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 implementing VXLAN with a centralized routing gateway. Which TWO statements are correct about BUM traffic handling?
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 sends a copy of the BUM packet to each remote VTEP via unicast
In a VXLAN centralized routing gateway deployment, ingress replication is a valid method for handling BUM traffic where the ingress VTEP sends a unicast copy of the BUM packet to each remote VTEP. This is correct because it eliminates the need for multicast in the underlay, making option B accurate. Ingress replication consumes more bandwidth on the source VTEP uplinks than multicast because it generates multiple unicast copies, whereas multicast sends a single stream that is replicated by the network, making option C correct.
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.
- ✗
Multicast in the underlay is always required for BUM traffic
Why it's wrong here
Ingress replication works without underlay multicast.
- ✓
Ingress replication sends a copy of the BUM packet to each remote VTEP via unicast
Why this is correct
Ingress replication encapsulates each copy as unicast.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Ingress replication consumes more bandwidth on the source VTEP uplinks than multicast
Why this is correct
Multiple copies consume more bandwidth.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Only the ingress VTEP handles BUM traffic
Why it's wrong here
Egress VTEPs also handle BUM forwarding to local endpoints.
- ✗
BUM traffic is never flooded to all VTEPs
Why it's wrong here
BUM is flooded to all VTEPs in the same VNI.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that multicast is mandatory for VXLAN BUM traffic, but the trap here is that ingress replication is a valid alternative that avoids multicast complexity, and candidates may incorrectly assume multicast is always required.
Detailed technical explanation
How to think about this question
Ingress replication, defined in RFC 7348, works by the ingress VTEP maintaining a list of remote VTEP IP addresses for each VNI and sending a separate unicast copy of the BUM frame to each. This consumes more bandwidth on the source VTEP's uplinks compared to multicast, which leverages IGMP snooping and PIM to replicate packets efficiently at the network layer. In a centralized routing gateway design, all inter-VNI routing occurs at a single gateway VTEP, so BUM flooding still reaches all VTEPs in the same broadcast domain to ensure ARP and unknown unicast delivery.
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 practitioner preparing for the 350-601 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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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: Ingress replication sends a copy of the BUM packet to each remote VTEP via unicast — In a VXLAN centralized routing gateway deployment, ingress replication is a valid method for handling BUM traffic where the ingress VTEP sends a unicast copy of the BUM packet to each remote VTEP. This is correct because it eliminates the need for multicast in the underlay, making option B accurate. Ingress replication consumes more bandwidth on the source VTEP uplinks than multicast because it generates multiple unicast copies, whereas multicast sends a single stream that is replicated by the network, making option C correct.
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
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.
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