多项选择题
A.192.168.194.160
B.192.168.183.41
C.192.168.159.2
D.192.168.183.255
E.192.168.179.4
F.192.168.184.45
单项选择题 What is the effect of using the service password-encryption comma（）。
单项选择题 Which protocol is an open standard protocol frame work that is commonly used in VPNs，to provid secureend-to-end communication？（）
单项选择题 If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?（）
