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A DNS server is a computer that runs a DNS server program, such as the DNS Server service or Berkeley Internet Name Domain (BIND). DNS servers contain DNS database information about some portion of the DNS domain tree structure and resolve name resolution queries issued by DNS clients. When queried, DNS servers can provide the requested information, provide a pointer to another server that can help resolve the query, or respond that the information is unavailable or does not exist. A DNS server is authoritative for a zone if it hosts the zone, either as a primary or sec ondary DNS server. A server is authoritative for a domain when that server relies on locally configured resource records, as opposed to cached information, to answer que ries about hosts within that domain. Such servers define their portion of the DNS namespace.

These methods of disambiguating a type are useful, but in some scenarios, you need to go further . Imagine that the Australian Boomerang Company (ABC) and the Alaskan Boat Corporation (ABC) are each creating a type, called BuyProduct, which they intend to ship in their respective assemblies . It s likely that both companies would create a namespace called ABC that contains a type called BuyProduct . Anyone who tries to develop an application that needs to buy both boomerangs and boats would be in for some trouble unless the programming language provides a way to programmatically distinguish between the assemblies, not just between the namespaces . Fortunately, the C# compiler offers a feature called extern aliases that gives you a way to work around this rarely occurring problem . Extern aliases also give you a way to access a single type from two (or more) different versions of the same assembly . For more information about extern aliases, see the C# Language Specification . In your library, when you re designing types that you expect third parties to use, you should define these types in a namespace so that compilers can easily disambiguate them . In fact, to reduce the likelihood of conflict, you should use your full company name (not an acronym or abbreviation) to be your top-level namespace name . Referring to the Microsoft .NET Framework SDK documentation, you can see that Microsoft uses a namespace of Microsoft for Microsoft-specific types . (See the Microsoft.CSharp, Microsoft.VisualBasic, and Microsoft.Win32 namespaces as examples .) Creating a namespace is simply a matter of writing a namespace declaration into your code as follows (in C#):

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Proxy classes are generated using the wsdl.exe tool, included with the .NET Framework and located in the C:\Program Files\Microsoft Visual Studio .NET\FrameworkSDK\Bin folder. The wsdl tool provides the command-line options described in Table 19-6.

Servers can be authoritative for one or more levels of the domain hierarchy. For exam ple, the root DNS servers on the Internet are authoritative only for the top-level domain names such as .com and not for subdomains such as lucernepublishing.com. The serv ers authoritative for .com are authoritative only for names such as lucernepublish ing.com, and not for third-level domains such as example.lucernepublishing.com. However, within the Lucerne Publishing namespace, the server or servers authoritative for example.lucernepublishing.com can also be authoritative for widgets.example.luc ernepublishing.com.

namespace CompanyName { public sealed class A { } namespace X { public sealed class B { ... } } } // TypeDef: CompanyName.A

A DNS zone is a contiguous portion of a namespace for which a server is authoritative. A server can be authoritative for one or more zones, and a zone can contain one or more contiguous domains. For example, one server can be authoritative for both microsoft.com and lucernepublishing.com zones, and each of these zones can include two or more domains. Contiguous domains such as .com, lucernepublishing.com, and example.lucernepub lishing.com can become separate zones through the process of delegation, by which the responsibility for a subdomain within the DNS namespace is assigned to a sepa rate entity. Zone files contain resource records for the zones for which a server is authoritative. In many DNS server implementations, zone data is stored in text files; however, DNS serv ers running on Windows 2000 or Windows Server 2003 domain controllers can also store zone information in Active Directory.

The comment on the right of the class definitions above indicates the real name of the type the compiler will emit into the type definition metadata table; this is the real name of the type from the CLR s perspective . Some compilers don t support namespaces at all, and other compilers are free to define what namespace means to a particular language . In C#, the namespace directive simply tells the

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