单项选择题
You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0.How many usable host addresses will there be per subnet?（）
A. 510 B. 1022 C. 2046 D. 8190
单项选择题 You have been allocated a /22 network.How many usable hosts are available?（）
单项选择题 What are the usable hosts on the .128.0/19 network?（）
单项选择题 You must segment your internal /24 network into a minimum of 12 subnets, each containing a minimum of 12 hosts.Which network mask do you use?（）
