Take the immediate list of a network admin’s duties into account, and it’s easy to see how simply tacking on the broad topic of “security” might quickly balloon into an unmanageable burden — or an unfulfilled task. Not to mention that if the last few months have taught us anything, it’s that IT security problems can come from more than just the network side. Security professionals need to be multi-faceted folks, comfortable with application-level discussions as well as network gear such as routers and firewalls, and even legal issues.
My advice? If your network is large, hiring even just one security professional is a worthwhile investment. If medium or small is more your measure, then hey, give one of us consultants a ring. Managed security services abound these days and can give you all the expertise your network needs at a fraction of the full-time cost. And do it soon, because this situation is going to get worse before it gets better.