Unfortunately, there aren't any magic answers. Server admins, network engineers and others can all have a security background and probably should, at least, have some basic security training. The abilities of those people whose primary job is something other than security will dictate how many dedicated security people you need. Also, if any of your security services are outsourced, that will affect your staffing needs as well. I'm sorry to be evasive on this question, but every company situation is unique.
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