Security

It is hard to protect against local hackers. By local hackers, I would assume that you mean in-house people that have access to log on to your network. You have to be sure that your file permissions are tight. Another measure that you can take is to do some major auditing. By this, you can tell who is accessing what files. If you know who they are, then your computer ethics policy will hopefully provide you enough amunition to get it stopped.

I meant in local network , how to protect my domain controller,Exchange, and file servers from local users .
any help will be apprechated.

Thank you