Refer to the exhibit.

IRF 1, at the campus core campus core, enables Internet Group Management Protocol (IGMP) on its VLAN3
interface. IRF 1 is also part of a multicast routing solution with the data center infrastructure devices. How can a
network administrator ensure that only endpoints that have registered for multicasts destined to 239.1.1.1
receive these multicasts?

A.
On every campus IRF virtual switch, set VLAN 3 as the multicast VLAN

B.
On IRF 1, enable IGMP snooping on VLAN3

C.
On each access layer IRF virtual switch, enable IGMP snooping on VLAN 3

D.
On each access layer IRF virtual switch, create a Layer 3 interface VLAN3. Enable IGMP on that interface

Explanation:
IGMP snooping enables Layer 2 switches to establish a Layer 2 multicast forwarding table instead of flooding
all multicast packets. To populate the Layer 2 multicast forwarding table, IGMP snooping listens to IGMP
messages exchanged between a Layer 3 multicast device and hosts.
07-IP Multicast Configuration Guide, 02-IGMP snooping configuration
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/
H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-
6W710/07/201301/772657_1285_0.htm