单项选择题
A. router(config-if)#ip address 142.8.2.1 subnet mask 255.255.252.0
B. router(config-if)#142.8.2.1 0.0.3.255
C. router(config-if)#ip address 142.8.2.1 255.255.252.0
D. router(config-if)#142.8.2.1 subnet mask 255.255.252.0
E. router(config-if)#ip address 142.8.2.1 0.0.3.255
F. router(config-if)#ip address 142.8.2.1 subnet mask /22
多项选择题 You have been asked to configure a default route. Which of the IOS commands mentioned below will accomplish this task?（）
单项选择题 Which of the following commands would you use, to configure a default route to any destination NOT found in the routing table?（）
多项选择题 Which of the commands below can you use to configure a default route?（）