- A
Head-end replication
Why wrong: Head-end replication is not a standard term; ingress replication is used.
- B
Egress replication
Why wrong: Egress replication is not a standard VXLAN term.
- C
Ingress replication
Ingress replication sends a copy of the BUM frame to each remote VTEP as unicast VXLAN packets.
- D
Multicast replication
Why wrong: Multicast replication requires multicast in the underlay.
Question 418 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 VXLAN overlay networks, which mechanism is used to forward broadcast, unknown unicast, and multicast (BUM) traffic when multicast is not enabled in the underlay?
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 overlay networks, when multicast is not enabled in the underlay, ingress replication is used to forward BUM traffic. With ingress replication, the source VTEP (ingress node) replicates the BUM packet and sends a separate unicast-encapsulated copy to each remote VTEP in the VXLAN segment. This avoids reliance on underlay multicast trees, making it suitable for networks that do not support multicast routing.
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.
- ✗
Head-end replication
Why it's wrong here
Head-end replication is not a standard term; ingress replication is used.
- ✗
Egress replication
Why it's wrong here
Egress replication is not a standard VXLAN term.
- ✓
Ingress replication
Why this is correct
Ingress replication sends a copy of the BUM frame to each remote VTEP as unicast VXLAN packets.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multicast replication
Why it's wrong here
Multicast replication requires multicast in the underlay.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'ingress replication' and 'head-end replication'—the trap is that candidates confuse the generic concept of head-end replication with the specific VXLAN term 'ingress replication', leading them to select the less precise option.
Detailed technical explanation
How to think about this question
Ingress replication is defined in RFC 7348 and is the default BUM handling method when multicast is not configured. The ingress VTEP maintains a list of remote VTEPs for each VXLAN segment (VNI) and sends a separate VXLAN-encapsulated copy to each, using the destination IP of each remote VTEP. This can lead to increased CPU and bandwidth usage on the ingress VTEP, especially in large fabrics, which is why multicast-based replication is preferred when the underlay supports it.
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
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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 overlay networks, when multicast is not enabled in the underlay, ingress replication is used to forward BUM traffic. With ingress replication, the source VTEP (ingress node) replicates the BUM packet and sends a separate unicast-encapsulated copy to each remote VTEP in the VXLAN segment. This avoids reliance on underlay multicast trees, making it suitable for networks that do not support multicast routing.
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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