- A
To reduce the need for ARP suppression
Why wrong: ARP suppression reduces broadcast ARP, but ingress replication handles BUM traffic.
- B
To forward broadcast, unknown unicast, and multicast traffic without requiring multicast in the underlay
Ingress replication sends BUM traffic as unicast to each remote VTEP.
- C
To enable multipathing of BUM traffic across multiple paths
Why wrong: Ingress replication does not inherently provide multipathing; ECMP may be used.
- D
To assign VXLAN Network Identifiers (VNIs) to tenant traffic
Why wrong: VNI assignment is a different process.
Question 395 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 overlay network, what is the primary purpose of ingress replication for BUM traffic?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
✓
To forward broadcast, unknown unicast, and multicast traffic without requiring multicast in the underlay
Ingress replication is a technique used in VXLAN overlay networks to handle BUM (Broadcast, Unknown unicast, Multicast) traffic without requiring a multicast-enabled underlay. The ingress VTEP (VXLAN Tunnel End Point) replicates the BUM packet and sends a separate unicast copy to each remote VTEP in the same VXLAN Network Identifier (VNI) segment, ensuring all relevant endpoints receive the traffic while relying solely on unicast routing 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.
- ✗
To reduce the need for ARP suppression
Why it's wrong here
ARP suppression reduces broadcast ARP, but ingress replication handles BUM traffic.
- ✓
To forward broadcast, unknown unicast, and multicast traffic without requiring multicast in the underlay
Why this is correct
Ingress replication sends BUM traffic as unicast to each remote VTEP.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
To enable multipathing of BUM traffic across multiple paths
Why it's wrong here
Ingress replication does not inherently provide multipathing; ECMP may be used.
- ✗
To assign VXLAN Network Identifiers (VNIs) to tenant traffic
Why it's wrong here
VNI assignment is a different process.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between ingress replication and multicast-based replication, and the trap here is that candidates may confuse ingress replication with ARP suppression or assume it provides multipathing, when in fact it is solely a method to forward BUM traffic without multicast 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 when no multicast group is configured in the underlay. In a real-world scenario, a large data center with thousands of VXLAN segments may avoid multicast altogether due to operational complexity, relying instead on ingress replication; however, this can cause significant replication overhead on the ingress VTEP, which must generate a separate copy for each remote VTEP, potentially impacting performance if the number of remote VTEPs is high.
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: To forward broadcast, unknown unicast, and multicast traffic without requiring multicast in the underlay — Ingress replication is a technique used in VXLAN overlay networks to handle BUM (Broadcast, Unknown unicast, Multicast) traffic without requiring a multicast-enabled underlay. The ingress VTEP (VXLAN Tunnel End Point) replicates the BUM packet and sends a separate unicast copy to each remote VTEP in the same VXLAN Network Identifier (VNI) segment, ensuring all relevant endpoints receive the traffic while relying solely on unicast routing 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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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