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单项选择题As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）

A、using DHCP snooping

B、snooping the incoming 802.1Q VLAN tag

C、using CDP

D、snooping the CoS marking on the incoming frames

  • C

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