350-601 Network Practice Question
An engineer is deploying a VXLAN overlay network in a data center using Cisco Nexus 9000 series switches. The network must handle BUM traffic efficiently across the fabric. Which method for BUM traffic handling requires the VTEP to maintain a list of all remote VTEPs and replicate packets individually?
⚠ Common exam trap
Cisco often tests the distinction between 'ingress replication' and 'multicast-based replication' by describing the behavior of the ingress VTEP maintaining a list and replicating individually, which directly maps to ingress replication, not multicast.
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
Ingress replication (Option D) is the correct method because it requires the ingress VTEP to maintain a list of all remote VTEPs in the VXLAN segment and replicate each BUM packet individually to each remote VTEP. This is a unicast-based replication approach that does not rely on multicast in the underlay, making it suitable for networks where multicast is not enabled or desired.
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-based replication
Why it's wrong here
Multicast-based replication uses a multicast group to forward BUM traffic, not individual replication.
- ✗
Suppression of BUM traffic
Why it's wrong here
Suppression is not a method for handling BUM traffic; it reduces flooding but not replication.
- ✗
Head-end replication
Why it's wrong here
Head-end replication is a similar concept but often used in other contexts; ingress replication is the correct term for VXLAN.
- ✓
Ingress replication
Why this is correct
Ingress replication requires the source VTEP to replicate packets to each remote VTEP individually.
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Senior Network & Security Engineer · founder of Courseiva
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