Multicast has been enabled and configured in the Enterprise, and PIM Sparse-mode has been enabled on all VLANs. What feature is required to stop multicast traffic from being broadcasted on the access layer switches?
I believe it is A.
In addition, in an interdomain environment, secure the data plane by using the multicast boundary command. The multicast boundary ensures that multicast traffic is accepted only for defined groups and potential sources.
Use the ip multicast boundary command to configure an administratively scoped boundary on an interface to filter multicast group addresses in the range that is defined by the access-list argument.
(ARCH 300-320 4th edition book)
I think it is IGMP snooping. Without this feature the switch will flood multicast packet to all ports on the broadcast domain
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Scheldon
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