单项选择题

Which Cisco IOS command globally enables port-based authentication on a switch？ （）

A.aaa port-auth enable
B.radius port-control enable
C.dot1x system-auth-control
D.switchport aaa-control enable

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单项选择题
Whatdoestheinterfacesubcommandswitchportvoicevlan222indicate？（）

A.The port is configured for both data and voice traffic.
B.The port is fully dedicated to forwarding voice traffic.
C.The port will operate as an FXS telephony port.
D.Voice traffic will be redirected to VLAN 222.
单项选择题
A remote host can be pinged from all switches except one.  Which of the following is the most likely reason for this failure？（）

A.VTP pruning has isolated the switch.
B.IP routing is disabled on the switch.
C.PoE is failing on the remote port.
D.There is a loop in the topology.
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