单项选择题
A. enable cdp
B. cdp enable
C. cdp run
D. run cdp
单项选择题 Which command is used to configure a default route?（）
单项选择题 A system administrator types the command to change the hostname of a router. Where on the Cisco IFS is that change stored? （）
单项选择题 Which command is used to load a configuration from a TFTP server and merge the configuration into RAM？（）