Active directory site replication occurs by using a KCC, Which is in avery site and creates a repliation topolgy to replicate the data from one domain to other domain and it uses RPC protocol to replicate data.
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Santosh Rawat
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Active Directory is called active bacause it is actively updating it's data through replication from differnt sites and other domain controllers with in the network
every three hours.
Active Directory Sites and Services
The Knowledge Consistency Checker (KCC) is a dynamic-link library (DLL) that runs as a distributed application on every domain controller. The KCC on each domain controller modifies data in its local instance of the directory in response to forest-wide changes, which are made known to the KCC by changes to data in the configuration directory partition. The KCC generates and maintains the replication topology for replication within sites and between sites by converting KCC-defined and administrator-defined (if any) connection objects into a configuration that is understood by the directory replication engine.
The Active Directory administrative tools can only be used from a computer with access to a domain. The following Active Directory administrative tools are available on the Administrative Tools menu: Active Directory Users and Computers (dsa.msc) Active Directory Domains and Trusts (domain.msc) Active Directory Sites and Services (dssite.msc)
Your question it not clear so .....Sites in Active Directory are the physical network structure of Active Directory based on subnet or subnets. Each site in Active Directory resembles well connected network. It is sometimes referred as physical structure of AD. Depending upon the locations and connection quality sites are created which include a domain or domains.Creating these sites lets you control replication traffic over WAN links. In a way Sites help define the AD's replication topology.
every 3 hours
One or more well-connected (highly reliable and fast) TCP/IP subnets. A site allows administrators to configure Active Directory access and replication topology to take advantage of the physical network. B: A Site object in Active Directory represents a physical geographic location that hosts networks. Sites contain objects called Subnets.[3] Sites can be used to Assign Group Policy Objects, facilitate the discovery of resources, manage active directory replication, and manage network link traffic. Sites can be linked to other Sites. Site-linked objects may be assigned a cost value that represents the speed, reliability, availability, or other real property of a physical resource. Site Links may also be assigned a schedule. Source: http://en.wikipedia.org/wiki/Active_Directory_Site#Sites
One or more well-connected (highly reliable and fast) TCP/IP subnets. A site allows administrators to configure Active Directory access and replication topology to take advantage of the physical network. B: A Site object in Active Directory represents a physical geographic location that hosts networks. Sites contain objects called Subnets.[3] Sites can be used to Assign Group Policy Objects, facilitate the discovery of resources, manage active directory replication, and manage network link traffic. Sites can be linked to other Sites. Site-linked objects may be assigned a cost value that represents the speed, reliability, availability, or other real property of a physical resource. Site Links may also be assigned a schedule. Source: http://en.wikipedia.org/wiki/Active_Directory_Site#Sites
Active Directory credentials to access SharePoint sites
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