单项选择题
A. RAM should be erased and the router restarted.
B. Flash should be erased and the router restarted.
C. NVRAM should be erased and the router restarted.
D. The new configuration should be entered and saved.
单项选择题 In the Cisco IOS, what is the definition of a global command?（）
单项选择题 After logging into a router, you type in "enable" and then enter the correct password when prompted. What is the current router prompt symbol at this point?（）
多项选择题 Which three of the following basic network services are provided by the Cisco IOS?（）