单项选择题
What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）
A.lowest port MAC address B.port priority number and MAC address. C.VTP revision number D.highest port priority number. E.path cost
单项选择题 Refer to the exhibit. Based on the information given. Which switch will be elected root bridge and why?（）
多项选择题 For what two purposes does the Ethernet protocol use physical addresses? （）
多项选择题 Which destination addresses will be used by Host A to send data to Host C?（）
