Technology has advanced over the past few years. Network administrators used to be able to control company PCs quite easily, but the proliferation of cheaper laptops, tablets and smartphones has made 'Bring Your Own Device' a real problem.
Any servers you have installed on your company's network should be located in a secure area. This can be anything from a simple, locked room to a temperature controlled, dedicated server farm. Whatever its size, you need a plan for protecting your server room!