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


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1.單項選擇題Which of these best describes the actions taken when a VTP message is received on a switch configured with the VTP mode "transparent"？（）

A.VTP updates are ignored and forwarded out all ports
B.VTP updates are ignored and forwarded out trunks only
C.VTP updates are made to the VLAN database and are forwarded out trunks only
D.VTP updates are ignored and are not forwarded

3.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

5.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