单项选择题
A. 30 networks and 6 hosts.
B. 6 networks and 30 hosts.
C. 8 networks and 32 hosts.
D. 32 networks and 18 hosts.
E. 14 networks and 14 hosts.
F. None of the above
单项选择题 You have a Class C network, and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?（）
多项选择题 Which two of the addresses below are available for host addresses on the subnet 192.168.15.19/28?（）
单项选择题 How do you express the binary number 10110011 in decimal form?（）