单项选择题

If a port configured with STP loop guard stops receiving BPDUs，the port will be put into which state？（）

A.learning state
B.listening state
C.forwarding state
D.root-inconsistent state

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多项选择题

A.Designated Root Cost
B.bridge ID priority
C.max age
D.bridge ID MAC address
E.Designated Root Priority
F.forward delay

单项选择题

A.one global STP instance for all VLANs
B.one STP instance for each VLAN
C.one STP instance per set of VLANs
D.one STP instance per set of bridges