350-601 Network Practice Question
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?
⚠ Common exam trap
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.
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.
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.
- ✗
Multicast replication
Why it's wrong here
Multicast replication requires multicast in the underlay.
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JA
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.