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An unauthorized DHCP server may either lease incorrect IP addresses to clients or negatively acknowledging DHCP clients. Clients that obtain a configuration lease from the unauthorized server can fail to locate valid domain controllers, preventing clients from successfully logging on to the network. For the directory authorization process to work properly, it is necessary that the first DHCP server introduced on to your network participate in the Active Directory service. The server must be installed as either a domain controller or a member server. The authorization process for DHCP server computers in Active Directory depends on the installed role of. | Implementing Managing and Supporting Windows 2000 Network Infrastructure Concepts DNS in a Windows 2000 Network Infrastructure DNS Overview DNS is the name service for Internet addresses used to translate friendly domain names to numeric IP addresses. Microsoft s web page http translates to . A host computer queries the name of a computer and a domain name server cross-references the name to an IP address. Windows 2000 clients use DNS for name resolution and locating domain controllers for logon. In the DNS the clients are resolvers and the servers are name servers. DNS uses three components resolvers name servers and the domain name space. A resolver sends queries to a name server. The name server returns the requested information a pointer to another name server or a failure message if the request cannot be satisfied. Resolvers Resolvers pass name requests between applications and name servers. The name request contains a query such as the IP address of a Web site. The resolver can be built into the application or may be running on the host computer as a library routine. Name Servers A name server contains address information about other computers on tile network. Name servers are grouped into domains. Access to each computer in a given group is controlled by the same server. If the name server is not able to resolve the request it can forward the request to another name server. Root-Level Domains Domains define levels of authority in a hierarchical structure. The top of the hierarchy is called the root domain. References to the root domain are expressed by a period . . Top-Level Domains Top-Level Domains include the following arpa Reverse DNS com edu gov mil net num org xx Commercial organizations Educational institutions and universities Nonmilitary government organizations Military government organizations Networks the backbone of the Internet Phone numbers Non-profit organizations Two-letter country code Second-Level Domains .

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