单项选择题
Three switches are connected to one anther via trunk ports.Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?（）
A.the switch with the lowest MAC address B.the switch with the higest MAC address C.the switch witch the higest IP address D.the switch with the lowest IP address
多项选择题 Refer to the exhibit.Which two statements are true of the interfaces on switch1?（）
多项选择题 Which two of these statements regarding RSTP are correct? （）
多项选择题 What are the possible trunking modes for a switch port? （）
