Which configuration is applied to prevent the network from a Layer 2 flooding of multicast...

To prevent the network from a Layer 2 flooding of multicast frames and ensure a seamless transfer of multicast data to the client when roaming, IGMP snooping should be enabled on the WLC. This feature allows the WLC to monitor and control multicast traffic at Layer 2, preventing unnecessary multicast forwarding.

References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )