单项选择题
A..65 through .126
B..64 through .127
C..66 through .128
D..65 through .127
单项选择题 What are the usable hosts on the 192.168.1.24/29 network?（）
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?（）