单项选择题
How many host addresses are available in the /28 network?（）
A. 6 B. 14 C. 28 D. 30
多项选择题 Which two prefixes would summarize the networks shown below?（）
单项选择题 What is the network address for the 10.13.147.100/19 host?（）
单项选择题 What is the last usable IP address in the 218.6.0.0/17 network?（）
