单项选择题
A. There is an error in the router DRAM.
B. Te IOS image is corrupt.
C. The configuration register is set to 0x2142.
D. The TFTP server that contains the router configuration file is unreachable.
E. A boot system configuration command has placed the router into setup mode.
单项选择题 Which command will reinitialize the router and totally replace the running configuration with the current startup configuration?（）
单项选择题 Exhibit: The following are true with one of the TestKing routers: 1) The IOS image in flash is missing 2) No Network connectivity is available. 3) The router fallback IOS image is corrupt. How will this Cisco 2600 series router respond if the conditions listed in the exhibit exist during the boot process?（）
单项选择题 The TestKing.com administrator has made changes to the router configuration but cannot remember if those changes were saved. Which of the following commands allows the administrator to see the configuration that will load when the router is restarted?（）