The bridgehead server is a domain controller that has been either administratively assigned or automatically chosen to replicate changes collected from other domain controllers in the site to bridgehead servers in other sites.
Bridgehead server
if you have not selected any DC as bridgehead server then it automatically follows ISTG - InterSite Topology Generator,chooses its own DC to replicate and if this link is down makes another but if you define bridgehead server,in that case if the link fails the replication stops.
No, you do not. You only install Active Directory if the system is going to be a domain controller. If it is a member server or a standalone server Active Directory should not be installed.
A Bridge head server is a domain controller that is used for intersite replication. This is the point of contact for a domain controller in another site. This passed replication traffic to a domain controller on another site. replication data is compressed and sent over IP or SMTP. To designate a preferred bridgehead server Open Active Directory Sites and Services -- In the console tree, right-click the domain controller that you want to make a preferred bridgehead server, and then click Properties -- On the General tab, click the intersite transport or transports for which this computer will be a preferred bridgehead server, and then click Add.
if you have not selected any DC as bridgehead server then it automatically follows ISTG - InterSite Topology Generator,chooses its own DC to replicate and if this link is down makes another but if you define bridgehead server,in that case if the link fails the replication stops.
Install active directory on the server
Active Directory was previewed in 1999, released first with Windows 2000 Server edition, and revised to extend functionality and improve administration in Windows Server 2003. Additional improvements were made in Windows Server 2003 R2. Active Directory was refined further in Windows Server 2008 and Windows Server 2008 R2 and was renamed Active Directory Domain Services. Active Directory was called NTDS (NT Directory Service) in older Microsoft documents. This name can still be seen in some Active Directory binaries.
In Windows Server 2011 it is called Active Directory.
Active Directory
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The DNS Server Role and the active directory is not installed till the adds service is started on the server 2008.if the service is not started(one needs to check the option under roles of the server)the active directory installation wont happen.this feature is only in 2008 not in 2003.The active directory works as service in 2008
Active Directory Domain Services. in server 2008 AD work as a service