单项选择题
You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）
A.192.168.252.8 255.255.255.248 B.192.168.252.8 255.255.255.252 C.192.168.252.16 255.255.255.240 D.192.168.252.0 255.255.255.252 E.192.168.252.16 255.255.255.252
单项选择题 Which command encrypts all plaintext passwords?（）
单项选择题 Which command enables IPv6 forwarding on a cisco router?（）
多项选择题 What are three features of the IPV6 protocol?（）
