350-601 Network Practice Question
An engineer is implementing VXLAN with a centralized routing gateway. Which TWO statements are correct about BUM traffic handling?
⚠ Common exam trap
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.
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.
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.
- ✓
Ingress replication consumes more bandwidth on the source VTEP uplinks than multicast
Why this is correct
Multiple copies consume more bandwidth.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.