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單項選擇題

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?（）

A. 510
B. 1022
C. 2046
D. 8190

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單項選擇題

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

單項選擇題

What is the operating system do Juniper Networks MX Series routers use?（）

A. IOS
B. MX-OS
C. UNIX
D. Junos OS

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