单项选择题
Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask wouldyou use?（）
A.255.255.0.0. B.255.255.128.0. C.255.255.224.0. D.255.255.254.0.
单项选择题 Which one of the binary bit patterns below denotes a Class B address?（）
单项选择题 What is the IP address range for the first octet in a class B address, in binary form?（）
单项选择题 What is the subnet for the host IP address 201.100.5.68/28?（）
