(第5空)Without proper safeguards, every part of a network is vulnerable to a security breach or unauthorized activity from ( ), competitors, or even employees. Many of the organizations that manage their own ( ) network security and use the Internet for more than just sending/receiving e-mails experience a network ( )—and more than half of these companies do not even know they were attacked. Smaller( )are often complacent, having gained a false sense of security. They usually react to the last virus or the most recent defacing of their website. But they are trapped in a situation where they do not have the necessary time and( )to spend on security.