单项选择题
You have been allocated a 192.168.100.0/22 network. How many usable host are available?（）
A. 510 B. 512 C. 1022 D. 1024
单项选择题 What represents the decimal equivalence of 01101110?（）
单项选择题 Which network mask is the equivalent of 255.255.248.0?（）
多项选择题 Which two statements are true regarding an Ethernet collision domain?（）
