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Which device replicates Broadcast. Unicast. and Multicast (BUM) frames to all remote sites in a Cisco ACI Multi-Site with multiple stretched bridge domains?
Correct Answer: C
In a Cisco ACI Multi-Site setup, the source leaf is responsible for flooding BUM (Broadcast, Unicast, and Multicast) traffic to the specific multicast group or GIPo (Group IP Overlay). This process involves the ingress replication function on the spine nodes of the source site to replicate BUM traffic to all remote sites where the bridge domain is stretched12. References := Cisco ACI Multi-Site Architecture White Paper, ACI Multi-Site Data Plane Communication - DCLessons