多项选择题
Which two states are the port states when RSTP has converged?（）
A.blocking B.learning C.discarding D.forwarding E.listening
多项选择题 In an Ethernet network, under what two scenarios can devices transmit? （）
多项选择题 Which of the following are benefits of VLANs? （）
多项选择题 What are three benefits of implementing vlans?（）
