This chapter covered the interrelation of DNS, DHCP, and Active Directory in the SBS environment. Because DNS and Active Directory are so interdependent, the network settings of all systems in the SBS network must be configured correctly for workstations to participate in the local domain as well as access the Internet. The DHCP Server service will pass on the necessary information to client workstations when the SBS server is configured correctly. The nslookup command can be used to troubleshoot DNS lookup issues internally and on the Internet. The Netlogon service ties Active Directory together with DNS, and removing the databases while restarting the service can easily clear up corruption within the Netlogon databases. The neTDiag and dcdiag commands are useful tools in diagnosing network and Active Directory issues.