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It directly depends upon following things and u can think of more. 1. Organization requirements towards security ( intend of your policies and procedures) 2.Oraganizatioin maturity level 3.Application dependencies 4.Availability of service

Really this depends on the szie of your domain. What might be overkill for one domain, might be very sparse for another.

Another big factor is the geographic area of the network. If you had a big office here and a smaller office down the road in a different building, you'd probably be aswell to put a DC in the small office even if you did only have 4 or 5 computers in it, you could even make the DC a global catalogue. But no matter how many DC's you have. A WAN is never truly going to be fault tolerant. For example the sql slammer worm a few years back took down hundreds of WAN's.

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Q: What is the minimum number of domain controllers you should configure to ensure that a domain is fault tolerant?
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Related questions

What is KCC in active directory?

knowledge consistency checker- it generates the replication topology by specifying what domain controllers will replicate to which other domain controllers in the site. The KCC maintains a list of connections, called a replication topology, to other domain controllers in the site. The KCC ensures that changes to any object are replicated to all site domain controllers and updates go through no more than three connections. Also an administrator can configure connection objects.


Every Active Directory domain should have a minimum of domain controllers?

Its is recommended just because in case of one fails other server can take over the roles and the network does not crash down.


What is the transfer of information among domain controllers to make sure all domain controllers have consistent and up-to-date information?

Replication


Domain controller computer accounts are placed in what container by default?

Domain Controllers OU


What domain controllers become global catalog servers by default?

first domain controller in the forest root domain.


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yes


Which file exists on all domain controllers?

Ntds.dit


What is the maximum number of domain controllers in a domain?

The recommended limit of DCs per domain as per Microsoft is 1200


What is the difference between outbound and inbound replication?

Outbound replication is when a domain controller transmits replication information to other domain controllers on a network andInbound replication is when a domain controller receives updates to the Active Directory database from other domain controllers on the network.


What is the KCC in AD?

The Knowledge Consistency Checker (KCC) is a built-in process that runs on all domain controllers and creates the replication topology for the forest. By default, the KCC runs at 15-minute intervals and designates the replication routes between domain controllers on the basis of the most favorable connections that are available at the time. The KCC creates replication connections between domain controllers in the same site automatically. When there is more than one site, configure links between the sites; the KCC can then create the connections automatically between the sites as well. from: http://technet.microsoft.com/en-us/library/dd277429.aspx


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the forest functional level win 2k3 interim,and win2k only do not support windows 2000 domain controllers rest does native and mixed