Active Directory Domain Services Introduction in Visual Studio .NET

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10 Active Directory Domain Services Introduction
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FIGURE 10-3 The BDC pulls all changes from the PDC Clients can authenticate against a
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PDC or BDC but have to direct all write changes to the PDC, which is the only domain controller holding a writeable copy of the database
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The frequency of change replication had limited con guration possibilities, however By default the PDC checked for changes every 5 minutes and would notify up to ten BDCs at a time The noti ed BDCs would then wait a random amount of time before contacting the PDC and asking for replication The random wait was to stop all ten BDCs from pulling the changes at the same time, thus overloading the PDC and potentially ooding the network with replication traf c There are three types of replication between the PDC and the BDC, and the replication is at an object level for all types This means the entire object is replicated, not just the attribute that changed, resulting in greater network usage
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Full Used when a new BDC is added or when the number of changes since the last replication is greater than the size of the PDC s change log le, %systemroot%\Netlogonchg By default this
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le is con gured to a maximum size of 65,536 bytes, which is normally 2,000 changes, although this can be adjusted via a Registry change Once the le reaches the maximum size, it starts overwriting the oldest entry Partial Used to replicate changes since the last replication Urgent Used to replicate when an account is locked out, a modi cation has been made to the account lockout or domain password policy, a machine account password changes, or a modi cation has been made to an LSA secret
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10 ACTIVE DIRECTORY DOMAIN SERVICES INTRODUCTION
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Replication could be forced using the various available tools For example, there was the Server Manager application, net accounts /sync, and nltest, which was a resource kit utility
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The domain is a corporate concept, and not many home users are expected to have the infrastructure to support a domain So, although all versions of Windows can be members of a workgroup, to become a member of a domain requires speci c versions of Windows Before AD, a domain s administrator had to allow a computer to be added to the domain Table 10-1 shows the various versions of the Windows operating system and their domain compatibility For computers that cannot be a member of a domain, one way to ease the integration is to set the computer s workgroup to the same name as the domain and create a local user with the same name as the domain account and with the same password This enables easier resource access Table 10-1 Versions of the Windows Operating System and Their Domain Compatibility
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Operating System Domain Compatible
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Windows 95 Windows 98/98se Windows Me Windows NT 4 Workstation Windows NT 4 Server
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No No No Yes Yes
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10 Active Directory Domain Services Introduction
Table 10-1 Versions of the Windows Operating System and Their Domain Compatibility
(continued) Operating System Domain Compatible
Windows 2000 Professional Windows 2000 Server (all versions) Windows XP Home Edition Windows XP Professional Windows 2003 Server (all versions) Windows Vista Starter, Home Basic and Home Premium Windows Vista Business, Enterprise, and Ultimate Edition Windows Server 2008 (all versions)
Yes Yes No Yes Yes No Yes Yes
Domain names prior to AD (and even AD maintains an old style, legacy-compatible name) were in Network Basic Input/Output System (NetBIOS) format, which has a maximum length of 16 characters although only the rst 15 characters are usable NetBIOS separates the details of the network from an application by enabling the application to specify a destination for a request NetBIOS is network independent and although it originally ran over NetBEUI, it was modi ed to run over Transmission Control Protocol/Internet Protocol (TCP/IP) also As mentioned previously, although NetBIOS names can be up to 16 characters, the maximum length for a domain name is actually 15 characters because the sixteenth character speci es the type of resource For example, <1C> speci es the resource is a domain controller See a full list of the NetBIOS suf xes in Knowledge Base article Q163409 at http://supportmicrosoftcom Limit domain names to using characters A Z, 1 9, and the hyphen character Other legal characters are ! @ # $ % ^ & ( ) - _ { } ~ although these characters can cause complications in other areas When a client needed to locate a domain controller, it had the NetBIOS name of the domain and knew its NetBIOS type was 1C These two bits of information could be used in three ways to locate a domain controller depending on the client con guration and services installed on the network (eg, WINS Request, Broadcast, or the LMHOSTS le) The actual order in which WINS request or broadcast occurs depends on the con guration node type of the client, as covered in 7, Advanced Networking Services