On a Cisco Nexus 7000 Series Switch， what is the purpose of this command？（） 
switch# config terminal 
switch（config）# mac address-table learning-mode conversational vlan 1-10 
switch（config）# 
 

A. Cisco NX-OS Software does not support PIM dense mode.
B. The command ip multicast-routing must be enabled in Cisco NX-OS Software before any multicast configuration is possible on the switch.
C. PIM CLI configuration and verification commands are not available until you enable the PIM feature with the feature pim command.
D. Cisco NX-OS Software supports multicast routing per Layer 3 VRF instance.
E. The default PIM operational mode on the Cisco Nexus 7000 switch is SSM.

A. The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transport
B. The L2 multicast frames are dropped because multicast cannot be carried across the overlay 
C. The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transport
D. The L2 multicast frames are forwarded natively across the overlay based on their multicast IDs

A. 128
B. 32
C. 64
D. Dependent on the number of switch IDs in the topology