Network Domain

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Network Domain
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• Network domain
• Group of Windows PC sharing a centralized DB
• Either NT Directory or the new Active Directory.
• NT/Active Directory
• Logical grouping of users and computers in a
  domain
• Centrally managed by servers called domain
  controllers

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• Domain Controllers (servers)
• Responds to security authentication
  requestswithin domain network

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How to set up a network domain?

• Requires Domain Controller (DC)
• Multiple domain controllers preferred
• Popular OS that supports DC
• Windows NT
• Windows Server 2000
• Windows Server 2003
• Windows Server 2008
• Only Windows Server OS can setup domains

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How domain controller works

• Varies on different Server OS
• Windows NT (outdated)
• Primary DC Backup DC concept
• Windows 2000 and later
• Multi-master replication concept

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PDC BDC concept

• 1 domain controller as Primary DC
• Others as Backup DC for the PDC
• PDC has the master copy of DB
• BDC could authenticate users
• Updates were made only to PDC
• PDC will propagate updates to all BDC

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Multi-master replication

• All DC in the domain are equally important
• Any DC in the group can update all the rest
• Multi-master replication system used for
  propagating
• But only one will take up that role at any
  time(Flexible Single Master Operation role)
• Advantage
• Domain can still function even if 1 server is
  down
• Alternate DC can presume the role.