You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0, How many usable host address will there e per subnet?（）

单项选择题Which statement is true about the routing table?（）

A. The routing table exists in the control plane only
B. The routing table exists in the control plane and the forwarding plane
C. The routing table contains both active and inactive routes
D. The routing table is stored on compact flash

单项选择题You want to log into the router and make a configuration change.After loggin in as the root user, what is the next command you must enter?（）

A. enable
B. configure
C. edit
D. cli