單項選擇題What is the purpose of the STP PortFast BPDU guard feature？（）

A.enforce the placement of the root bridge in the network
B.ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C.enforce the borders of an STP domain
D.ensure that any BPDUs received are forwarded into the STP domain


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2.單項選擇題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

3.多項選擇題Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D？（）

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

4.單項選擇題Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these？ （）

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