单项选择题 After making some network changes you power off and then power on your Cisco router. What sequence of events occurs when a router is powered up?（）

单项选择题 You are unable to connect to the TESTKING1 router. Which of the following command sequences will correct this problem?（）

单项选择题 You want the text "Unauthorized access prohibited!" to be displayed before the login prompt every time someone tries to initiate a Telnet session to a router, as shown in the example below: Which command can be used to configure this message?（）