Physical security for your servers may be useless if you don't secure your UPS also.
Setting up disk quotas manually is good for small networks but for larger ones group policy can make this a lot easier.
Implementing DHCP usually seems like a pretty straightforward process but there are a few things that are often forgotten during the planning phases of a DHCP implementation.
Ever have a server setup that you really don’t want people knowing even exists? Keeping it from returning ping responses is a great way to make it vanish.
Using strong passwords is useless if they are not encrypted properly. That’s why disabling LM authentication is important.