You administer several switches on a network. The switches are configured with the default MLD snooping settings. Several VLANs are configured on each switch.
Which of the following statements is most accurate? (Select the best answer.)

A. The switches will not forward IPv6 multicast traffic.
B. The switches will forward IPv6 multicast traffic to every port.
C. The switches will forward IPv6 multicast traffic only to ports on the default VLAN.

D. The switches will forward IPv6 multicast traffic only to ports from which an MLD INCLUDE message has been received.

E. The switches will forwardIPv6 multicast traffic to all ports except those from which an MLD EXCLUDE message has been received.

Explanation:

The switches will forward IPv6 multicast traffic only to ports from which a Multicast Listener Discovery (MLD) INCLUDE message has been received. MLD snooping enables switches to listen to MLD traffic. When an MLD INCLUDE message is received on a port, the switch adds the port number to the list of ports that should receive traffic for that IPv6 multicast group. If no MLD traffic is detected on a port for 60 seconds, or if an MLD EXCLUDE message is received on a port, the switch sends a general query to determine whether there are any other hosts on that port that are interested in receiving traffic for the specified IPv6 multicastgroup. If no control packet is received on the port for five minutes, the multicast router information is aged out. MLD messages are sent with a timetolive (TTL) value of 1, which means that an MLD message is sent only to the next hop.
By default, MLD snooping is enabled for all virtual LANs (VLANs), not just the default VLAN. You can globally disable MLD snooping on a switch by issuing the no ipv6 mld snoopingcommand from global configuration mode. Alternatively, you can disable MLD snooping on a particular VLAN by issuing the no ipv6 mld snooping command from interface configuration mode for that VLAN. When MLD snooping is disabled, switches will flood IPv6 multicast traffic to every port in every VLAN. To reenable MLD snooping, you should issue the ipv6 mld snooping command from global configuration mode or from interface configuration mode.

Reference:
Cisco: MLD Snooping for IPv6 Multicast Traffic