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DNS queries resolve in a number of different ways. In a basic scenario, the DNS client contacts a DNS server, which then uses its own database of resource records to answer a query. However, by referring to its cache first, a DNS client can sometimes answer a query without contacting a server at all. Another way that DNS queries are often resolved is through recursion. (See the section Understanding Recursion later in this lesson for more information.) Using this process, a DNS server can query other DNS servers on behalf of the requesting client in order to resolve the FQDN. When the DNS server receives the answer to the query, it then sends an answer back to the client. A final method by which DNS queries are resolved is through iteration (also explained in more detail in the Understanding Recursion section). Through this process, the client itself attempts to contact additional DNS servers to resolve a name. When a client does so, it uses separate and additional queries based on referral answers from DNS servers.

The language (or languages) you use when creating startup/shutdown and logon/logoff scripts must be supported by the computers that will run them. If you still have computers on your network running the DOS-based versions of Windows, such as Windows ME, Windows 98, Windows 95, and Windows NT, your only choice for these computers is batch scripting. For computers running Windows 2000 and later, WSH is an extensible hosting engine that can provide support for many languages, but Windows supports only VBScript and JScript by default. You can use other languages supported by WSH to create your scripts, but you must install the additional scripting engines on all of your client computers before they can execute the scripts. In the same way, your workstations must support Windows PowerShell if you choose that language for your scripts. Windows 7 and Windows Server 2008 R2 include support for Windows PowerShell by default, but on Windows Server 2008, you must add it as a feature. On Windows Vista, Windows XP, and Windows Server 2003, you must download Windows PowerShell as a separate package and install it before the computers can run Windows PowerShell scripts.

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In general, the DNS query process occurs in two parts:

Northwind Traders manufactures a line of network appliances designed to help com panies improve their data transmission capabilities. Northwind Traders currently uses a Microsoft Windows NT 4.0 master domain model. In recent years, the company has undergone significant growth and expansion. The company expects substantial growth during the next three years, including growth in market share, revenue, and number of employees. In addition to opening two new offices, the executive management has committed to implementing a new Windows Server 2003 Active Directory design to meet the current and future needs of the company. The following table shows the geographical locations, the departments residing in each location, and the number of users in each of the locations.

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When the query cannot be resolved locally, DNS servers can be queried as needed to resolve the name.

Location Paris, France Departments Represented Headquarters (HQ) Management staff Finance Sales Marketing Production Research Development Information Technology (IT) Sales Marketing Finance IT Customer Service Customer Support Training Research Development Sustained Engineering IT Number of Users 2,000

Both of these processes are explained in more detail in the following sections. Part 1: The Local Resolver Figure 4-1 presents an overview of the default DNS query process, in which a client is configured to make recursive queries to a server. In this scenario, if the DNS Client service cannot resolve the query from locally cached infor mation, the client makes only a single query to a DNS server, which is then responsible for answering the query on behalf of the client. In the figure, queries and answers are represented by Qs and As, respectively. The higher numbered queries are made only when the previous query is unsuccessful. For example, Q2 is performed only when Q1 is unsuccessful.

DNS client (resolver) Client-to-server query Zones Server-to-server query (recursion)

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Q3 A3 DNS resolver cache Web browser URL: www.microsoft.com Q1 A1 Q2 A2 DNS server Q4 A4 HOSTS file

Root hints file (Cache.dns)

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There are two ways to deploy scripts to your workstations: by specifying them in user objects and by using Group Policy, as described in the following sections.

Figure 4-1

The query process begins when a DNS domain name is used in a program on the local computer. In the example shown in Figure 4-1, a Web browser calls the FQDN www.microsoft.com. The request is then passed to the DNS Client service (the DNS resolver cache) to resolve this name by using locally cached information. If the queried name can be resolved, the query is answered and the process is completed.

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