单项选择题
A.FlowB.StateC.TransformationD.Successive points
A.EHLOB.HELOC.RCPTD.AUTH
A.802.1x authenticationB.Port securityC.ARP snoopingD.DHCP snooping
A.MAC spoofingB.CAM table overflowC.Route poisoningD.DHCP Starvation
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