- A
ARP suppression
Why wrong: ARP suppression reduces ARP broadcasts but does not handle all BUM traffic.
- B
Head-end replication
Why wrong: Head-end replication is a term sometimes used synonymously with ingress replication, but it is not a standard Cisco term for VXLAN BUM handling.
- C
Multicast group
Why wrong: Multicast requires multicast routing in the underlay.
- D
Ingress replication
Ingress replication uses unicast tunnels to replicate BUM traffic, no multicast needed.
Question 165 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 in a data center. The network must handle BUM traffic without relying on IP multicast in the underlay. Which BUM handling method should be chosen?
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
In VXLAN environments that must avoid IP multicast in the underlay, ingress replication is the correct BUM handling method. It replicates broadcast, unknown unicast, and multicast (BUM) traffic at the ingress VTEP and sends a copy to each remote VTEP via unicast encapsulation, eliminating the need for multicast group membership in the underlay.
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.
- ✗
ARP suppression
Why it's wrong here
ARP suppression reduces ARP broadcasts but does not handle all BUM traffic.
- ✗
Head-end replication
Why it's wrong here
Head-end replication is a term sometimes used synonymously with ingress replication, but it is not a standard Cisco term for VXLAN BUM handling.
- ✗
Multicast group
Why it's wrong here
Multicast requires multicast routing in the underlay.
- ✓
Ingress replication
Why this is correct
Ingress replication uses unicast tunnels to replicate BUM traffic, no multicast needed.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'ingress replication' and 'head-end replication'—while they are functionally similar, the exam expects 'Ingress replication' as the correct Cisco term for unicast-only BUM handling, and 'Head-end replication' is a distractor that may confuse candidates into thinking it is a different method.
Detailed technical explanation
How to think about this question
Ingress replication is defined in RFC 7348 and works by the ingress VTEP maintaining a list of all remote VTEPs (typically learned via BGP EVPN or static configuration) and sending a separate VXLAN-encapsulated unicast packet to each. This method increases bandwidth usage on the ingress link compared to multicast, but it is essential when the underlay lacks multicast support, such as in IP fabrics using OSPF or BGP without PIM. In real-world deployments, ingress replication is often combined with ARP suppression to reduce BUM traffic volume, but the replication method itself remains unicast-based.
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: Ingress replication — In VXLAN environments that must avoid IP multicast in the underlay, ingress replication is the correct BUM handling method. It replicates broadcast, unknown unicast, and multicast (BUM) traffic at the ingress VTEP and sends a copy to each remote VTEP via unicast encapsulation, eliminating the need for multicast group membership in the underlay.
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.
About these practice questions
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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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