In the Cisco FabricPath domain， one switch becomes the root for the multidestination tree. Cisco FabricPath switches compare which three parameters to select the root？ （）

单项选择题WhereisatypicalrequestintheCiscoUCSXMLAPIplacedinthedatamanagementengine，and，aftertherequestisconfirmed，whatisupdated？（）

A. The request is placed in the transactor queue in FIFO order and the management information tree is updated.
B. The request is placed in the replicator and persistifier and the store is updated.
C. The request is placed in the data management engine and the application gateway is updated. 
D. The request is placed in the buffer queue and the commit buffer queue is updated.

单项选择题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. Enable conversational learning on FabricPath vlans 1-10 for F-Series module
B. Enable FabricPath protocol on VLANs 1–10
C. No need for this command as conversational learning is enabled by default for all VLANs.
D. Enable conversational learning on Classical Ethernet VLAN for F-Series module

多项选择题WhichthreestatementsbestdescribemulticastoperationonCiscoNexusswitchesinadatacenter？（）

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.

单项选择题WhenusingOverlayTransportVirtualization（OTV），howdoL2multicastframestraversetheoverlay？（）

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

单项选择题WhatisthedefaultTimetoLive（TTL）valuseinCiscoFabricPath？（）

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