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What Are Name Servers
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A DNS name server stores the zone database file. Name servers can store data for one zone or multiple zones. A name server is said to have authority for the domain name space that the zone encompasses. One name server contains the master zone database file, referred to as the primary zone database file, for the specified zone. As a result, there must be at least one name server for a zone. Changes to a zone, such as adding domains or hosts, are performed on the server that contains the primary zone database file.
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Lesson 2
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Understanding the Domain Name System 13-31
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Multiple name servers act as a backup to the name server containing the primary zone database file. Multiple name servers provide the following advantages:
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They perform zone transfers. The additional name servers obtain a copy of the zone database file from the name server that contains the primary database zone file. This process is called a zone transfer. These name servers periodically query the name server containing the primary zone database file for updated zone data. They provide redundancy. If the name server containing the primary zone database file fails, the additional name servers can provide service. They improve access speed for remote locations. If there are a number of clients in remote locations, use additional name servers to reduce query traffic across slow wide area network (WAN) links. They reduce the load on the name server containing the primary zone database file.
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Real World Active Directory and DNS
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Active Directory and DNS are tightly integrated they even share a common namespace. It is essential, therefore, that you understand how each system works and how they work together. DNS is the locator service used by Active Directory (and by many other Windows components). Active Directory makes its services available to the network by publishing them in DNS. When a domain controller is installed (or when services are added to it), the domain controller uses dynamic updates to register its services as SRV records in DNS. Clients can then locate services through simple DNS queries. The Microsoft DNS Service runs on every Windows Server 2003 domain controller by default.
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Lesson Review
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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. What is DNS and what is it used for
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13-32
13
Supporting TCP/IP
2. Which of the following statements correctly describes DNS root domains (Choose all that apply.) a. The root domain is at the top of the hierarchy. b. The root domain is at the bottom of the hierarchy. c. The root domain is represented by a two- or three-character name code. d. The root domain is represented by a period (.). 3. Which of the following are second-level domain names (Choose all that apply.) a. gov b. Microsoft.com c. au d. ed.gov 4. ________________ provide a way to partition the domain namespace into manageable sections, and each ________________ represents a discrete portion of the domain namespace.
Lesson Summary
The DNS database is indexed by name, so each domain (node) must have a name. The hierarchical structure of the domain namespace consists of a root domain, top-level domains, second-level domains, and host names. When creating a domain namespace, you should use certain guidelines, such as limiting the number of domain levels and using unique and simple names. Zones provide a way to partition the domain namespace into smaller sections, so a zone represents a discrete portion of the domain namespace. A DNS name server stores the zone database file. Name servers can store data for one zone or multiple zones. A name server is said to have authority for the domain namespace that the zone encompasses.
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