单项选择题

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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问答题

Which picture is Traffic Shape， why ？

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

多项选择题

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