- A
Ingress replication sends unicast copies of the BUM traffic to each remote VTEP.
Correct description.
- B
BUM traffic is dropped by default.
Why wrong: BUM traffic must be handled for proper operation.
- C
Multicast group is used to distribute BUM traffic to all VTEPs that need it.
Correct description.
- D
Ingress replication sends a single multicast packet to all VTEPs.
Why wrong: Ingress replication sends unicast copies to each VTEP.
- E
Multicast is required for VXLAN BUM handling.
Why wrong: Multicast is optional; ingress replication can be used.
Question 295 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.
Which two statements correctly describe VXLAN BUM traffic handling? (Choose two.)
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 unicast copies of the BUM traffic to each remote VTEP.
In VXLAN, BUM traffic (Broadcast, Unknown unicast, Multicast) can be handled using ingress replication, where the ingress VTEP creates multiple unicast copies of the packet and sends them directly to each remote VTEP. This is the default mode in many VXLAN implementations, especially in EVPN-based fabrics, and does not require a multicast group in the underlay. Option A 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.
- ✓
Ingress replication sends unicast copies of the BUM traffic to each remote VTEP.
Why this is correct
Correct description.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
BUM traffic is dropped by default.
Why it's wrong here
BUM traffic must be handled for proper operation.
- ✓
Multicast group is used to distribute BUM traffic to all VTEPs that need it.
Why this is correct
Correct description.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Ingress replication sends a single multicast packet to all VTEPs.
Why it's wrong here
Ingress replication sends unicast copies to each VTEP.
- ✗
Multicast is required for VXLAN BUM handling.
Why it's wrong here
Multicast is optional; ingress replication can be used.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that multicast is mandatory for VXLAN BUM handling, but the exam expects you to know that ingress replication is a valid and commonly used alternative, especially in EVPN-based designs.
Detailed technical explanation
How to think about this question
Ingress replication is defined in RFC 7348 and is the simplest BUM handling method, but it scales poorly as the number of VTEPs increases because the ingress VTEP must replicate packets for each remote VTEP. In contrast, multicast-based distribution uses a multicast group in the underlay (e.g., 239.1.1.1) to efficiently deliver BUM traffic to all VTEPs that have joined that group, reducing replication load on the ingress VTEP. In EVPN VXLAN deployments, ingress replication is often combined with BGP EVPN control plane to dynamically learn remote VTEP addresses.
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 sends unicast copies of the BUM traffic to each remote VTEP. — In VXLAN, BUM traffic (Broadcast, Unknown unicast, Multicast) can be handled using ingress replication, where the ingress VTEP creates multiple unicast copies of the packet and sends them directly to each remote VTEP. This is the default mode in many VXLAN implementations, especially in EVPN-based fabrics, and does not require a multicast group in the underlay. Option A 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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