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（请作答此空）to spend on security.