Before DNS, HOSTS files were used to resolve host names to IP addresses. The HOSTS files were manually maintained by administrators. The HOSTS file was located on a centrally administered server on the Internet. Because of the shortcomings of the HOSTS files, DNS was designed and introduced. From the days of Windows NT Server 4.0, DNS has been included with the operating system. DNS is a hierarchically distributed and scalable database. DNS provides name registration, name resolution and service location for Windows 2000 and Windows Server 2003 clients.
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