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單項選擇題
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
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