Maybe you’re a brand new network admin. You’ve taken some courses, you’ve passed some certification exams, perhaps you even have a Windows domain set up at home. But you’ll soon find that being responsible for a company network brings challenges you hadn’t anticipated.

Or maybe you’re an experienced corporate IT person, but up until now, you’ve worked in a UNIX environment. Now — either due to a job change or a new deployment in your current workplace — you find yourself in the less...