单项选择题
A.14
B.15
C.16
D.30
E.31
F.32
单项选择题 Your TestKing trainee Bob asks you what 11111001 binary is in decimal. What should you tell him?（）
单项选择题 You work as network consultant. Your customer, TestKing Inc, has a class C network license. TestKing wants you to subnet the network to provide a separate subnet for each of its 5 departments. Each subnet must support at least 24 hosts. Which network mask should you use?（）
单项选择题 If an Ethernet port on router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?（）