单项选择题
A.802.1wB.802.3adC.802.1D.D.802.1q
A.mirroringB.spanningC.monitorD.mary
A.channel-portB.fastEthernetC.EthernetD.gigabitEthernet
A.port-group1B.channel-groupC.no switch-portD.access-group
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