"Script kiddies, far eastern organized crime gangs, disgruntled employees: you name them and the chances are that at some point in the future your network will come under attack from them. In fact it probably already has.
"Network security is a tricky problem for administrators because there's nothing you can do to make your network completely secure forever--security is a continuous process, and the aim must be to make it secure enough to make the risk of penetration acceptable, at an acceptable cost..."
