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Configuring DNS Servers and Clients
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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. The network you administer includes 10 computers running Windows Server 2003 and 200 computers running Microsoft Windows XP Professional. In the network, you have deployed a DNS server named DNS1 to host the zone lucernepublish ing.com. You have also configured the zone to allow dynamic updates. A DHCP server is responsible for the IP configuration of all computers running Windows XP Professional. One of these computers, c1.lucernepublishing.com, can be con tacted only by IP address and not by name. Which of the following actions can you take to reregister this computer in DNS (Choose all that apply.) a. Execute the Nbtstat R command. b. Execute the Ipconfig /registerdns command. c. Shut down and restart c1.lucernepublishing.com. d. Execute the Nbtstat /registerdns command. 2. Which of the following is a legal NetBIOS computer name a. host1.microsoft.com b. host1_local c. host10_microsoft d. host1-microsoft 3. Which command can you use to purge the local NetBIOS name cache
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Two types of computer names usually exist in Windows Server 2003 networks: DNS names and NetBIOS names. Each name type requires its own mechanism for being resolved to IP addresses. NetBIOS names and the NetBIOS protocol are required for Windows NT domains, for pre-Windows 2000 workgroups, and for compatibility with certain network services, such as the Computer Browser service. DNS names and the DNS protocol are required for Active Directory domains and for compatibility with the Internet or intranets.
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To resolve computer names, the DNS Client service in Windows Server 2003 always attempts DNS name resolution before NetBIOS name resolution. Both NetBIOS names and DNS names are based on the name you assign a com puter in the System Properties dialog box. If you assign a computer name longer than 15 characters, NetBIOS uses a version of the name that is truncated to 15 characters.
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4
Configuring DNS Servers and Clients
Lesson 2: Understanding DNS in Windows Server 2003 Networks
DNS enables you to locate computers and other resources by name on an IP internetwork. Before DNS, host names in IP networks were organized in a flat namespace and resolved with static Hosts files. By providing a hierarchical structure and an automated method of caching and resolving host names, DNS resolves many of the administrative and structural difficulties associated with naming hosts on the Internet.
After this lesson, you will be able to
Describe the structure of DNS namespaces Describe how the Internet namespace is organized and governed Describe components of DNS networks such as DNS servers, DNS clients, resolvers,
forwarders, zones, roots, and resource records
Describe how name queries are handled by DNS clients and servers Describe the function of the root hints file
Estimated lesson time: 50 minutes
Exploring DNS
DNS allows people and programs to connect to IP hosts by specifying a name such as ftp.lucernepublishing.com. In doing so, DNS provides a standard both for naming hosts and for locating IP hosts specified by name.
DNS Namespace
The naming system on which DNS is based is a hierarchical and logical tree structure called the DNS namespace. The DNS namespace has a unique root that can have any number of subdomains. In turn, each subdomain can have more subdomains. For example, the root (empty string) in the Internet namespace has many top-level domain names, one of which is com. The domain com can, for example, have a subdomain for the Lucerne Publishing company, lucernepublishing.com, which in turn can have a further subdomain for manufacturing, called mfg.lucernepublishing.com. Organizations can also create private networks and use their own private DNS namespaces that are not visible on the Internet.
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