单项选择题
Which one of the binary bit patterns below denotes a Class B address?（）
A. 0xxxxxxx B. 10xxxxxx C. 110xxxxx D. 1110xxxx E. 11110xxx
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?（）
单项选择题 What is the subnet for the host IP address 172.16.210.0/22?（）
