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DNS and DHCP
If we consider Active Directory Domain Services (AD DS) to be the most common and central role in making our Microsoft-centric networks function, then the DNS and DHCP roles slide in at numbers two and three. I am yet to meet an admin who has chosen to deploy a new domain without deploying DNS at the same time, and every network has a need for DHCP whether or not that service is provided by a Windows server. Either of these roles could be served by something other than a traditional server. There are other companies and even dedicated appliances that exist to provide DNS within a corporate network, which have some advantages and some disadvantages. Regarding DHCP, there are plenty of options for providing that service outside ...
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