单项选择题 The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?（）

多项选择题 Your ISP has assigned you the following IP address and subnet mask: IP address: 199.141.27.0 Subnet mask: 255.255.255.240 Which of the following addresses can be allocated to hosts on the resulting subnet?（）

多项选择题 Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet?（）