单项选择题
You are the network consultant from passguide.com. Could you please tell customers what strategy will protect network resources and services from unauthorized actions?（）
A.Network management B.Network optimization C.Network security D.Content storage networking
单项选择题 Which network technology addresses these customer business needs: shrinking budgets and IT staffs, more complex networks, and an increased need for network security?（）
单项选择题 What does a router do?（）
单项选择题 Which component should you use to reduce collision issues on a large LAN?（）
