System Admin vs. Security Admin

Network administration is about ensuring that users can get to everything they need, security is about restricting access to things. So security administration at its core is fundamentally oposed to network adminstration - they have, in fact, conflicting goals.

Ideally, a security administrator should be someone who understands system and network administration, but whose job it is to think about security first, and usability/usefulness second. This person would need to work closely with the network/system administrator.

Adopted from from Protect Your Windows Network : From Perimeter to Data by Jesper M. Johansson, Steve Riley.