單項(xiàng)選擇題The classic Spanning Tree Protocol （802.1D  1998） uses which sequence of variables to determine the best received BPDU？（）

A.lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path cost
B.lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port id
C.lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port id
D.lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id


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4.單項(xiàng)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

5.多項(xiàng)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