单项选择题
Where does routing occur within the DoD TCP/IP reference model?（）
A.application B.internet C.network D.transport
多项选择题 Which two states are the port states when RSTP has converged?（）
多项选择题 WhichcommandsarerequiredtoproperlyconfigurearoutertoproperlyconfigurearoutertorunOSPFandtoaddnetwork192.168.16.0/24toOSPFarea0？（）
单项选择题 How many addresses for hosts will the network 124.12.4.0/22 provide?（）
