单项选择题
A..24 through .48
B..24 through .32
C..25 through .30
D..35 through .31
单项选择题 You have been asked to use a 28 bit subnet mask to segment the following network block: 108.12.5.0. How many usable hosts per sub-net could you create?（）
单项选择题 You have been asked to use a 30 bit subnet mask to segment the following network block: 108.12.5.0. How many useable subnetworks and usable hosts could be created?（）
多项选择题 Which three steps are part of the PPP CHAP 3-way handshake?（）