单项选择题 Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）

单项选择题 Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?（）

单项选择题 What is the most likely reason for the dispartly between the actual network numbers at the branches and the routes in the routing table on Gateway-Router?（）