Enhance security by preventing ordinary users from being able to install devices.
If DHCP is absolutely critical to your network, be paranoid and keep a hot-spare DHCP server available.
It is difficult to protect devices that you don't even know exist. In larger enterprises it is very easy to lose track of the asset inventory which leads to complacency about rogue devices. In order to effectively protect the network and to respond to incidents efficiently, an updated asset inventory and network map should always be handy.
Forget the 80/20 rule for DHCP server availability and use 50/50 instead.
The default pagefile size isn't always enough for best performance, especially when you're running memory-hungry server apps.