Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream
receivers are sent on the multicast router-connected ports?
A.
IGMP snooping
B.
Router Guard
C.
PIM snooping
D.
multicast filtering
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Ideally, the Layer 2 device should forward the multicast transmission only out ports to which
receivers are connected and also out any ports that are connected to downstream multicast
routers. This configuration requires a Layer 2 device to be able to determine the ports on which
multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To
facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two
mechanisms:
Reference.
https://www.informit.com/library/content.aspx?b=CCNP_Studies_Switching&seqNum=59
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IGMP snooping restricts multicast traffic that exits through the LAN ports to which hosts are connected. IGMP snooping does not restrict traffic that exits through the LAN ports to which one or more multicast routers are connected.
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switch needs to support this feature
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