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Summary

In this hour, you looked at the Domain Name Service. DNS provides a hierarchical name-resolution system for resolving FQDNs (friendly) to IP addresses. Each organization typically deploys its own DNS server that handles the resolution duties of that domain.

The root of the DNS tree is represented by the . (dot). Top-level domains under the root are identified by suffixes such as com, edu, and biz. Computer hostnames consist of the name of the computer followed by the DNS domain name (the child domain preceding the parent domain).

The Windows Server 2008 implementation of DNS is Microsoft’s dynamic DNS, also called DDNS in earlier implementations of the Windows Server product. Dynamic DNS enables DNS clients to automatically update their client resource records in the DNS database. Because the database is configured automatically, you spend much less time creating resource records.

The Windows Server 2008 DNS service is installed in the Add Roles Wizard. For the DNS service to operate correctly, you must configure a forward lookup zone on the server. This allows for resolution from hostname to IP address. Reverse lookup zones are used to resolve IP addresses to hostnames. Reverse lookup zones are useful but are not required on your DNS server. DNS is managed in the DNS snap-in, which can be accessed in the Server Manager or the MMC snap-in.

You can use the snap-in to view resource records in your zones, create new zones (and delete zones), and create new resource records. DNS clients are computers that have been configured to refer to a preferred DNS server when they need to resolve a hostname to an IP address (or vice versa). You can specify a preferred DNS server in the client’s TCP/IP properties. Or you can configure your DHCP server to provide DHCP clients with the IP address of a preferred DNS server.

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