Define a maintenance schedule for DHCP and all other Microsoft JET-based databases.
Implement redundancy in a DHCP and WINS infrastructure.
Dedicate multiple utility servers running WINS in large environments.
Schedule maintenance for each WINS database on a quarterly or semi-annual basis.
Properly plan the most efficient placement of DCs and GC/DCs in an environment.
Use a single DC configured with universal group caching for AD sites with fewer than 50 users who do not need a local GC for services such as Exchange.
Use at least two DCs in AD sites with between 50 and 100 users.