单项选择题
If an ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet（）。
A.1024 B.2046 C.4094 D.4096 E.8190
多项选择题 Which two are features of IPv6?（）
多项选择题 Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true? （）
单项选择题 Which command enables RSTP on aswitch?（）
