Global Catalog Server

Every domain controller stores the objects for the domain in which it is installed. However, a domain controller designated as a global catalog server stores the objects from all domains in the forest. For each object that is not in the domain for which the global catalog server is authoritative as a domain controller, a limited set of attributes is stored in a partial replica of the domain.

Therefore, a global catalog server stores its own full, writable domain replica (all objects and all attributes) plus a partial, read-only replica of every other domain in the forest. The global catalog is built and updated automatically by the AD DS replication system.

The object attributes that are replicated to global catalog servers are the attributes that are most likely to be used to search for the object in AD DS. The attributes that are replicated to the global catalog are identified in the schema as the partial attribute set (PAS) and are defined by default by Microsoft. However, to optimize searching, you can edit the schema by adding or removing attributes that are stored in the global catalog.

The global catalog makes it possible for clients to search AD DS without having to be referred from server to server until a domain controller that has the domain directory partition storing the requested object is found.

By default, AD DS searches are directed to global catalog servers. The first domain controller in a forest is automatically created as a global catalog server.

Thereafter, you can designate other domain controllers to be global catalog servers if they are needed. So, that’s all in this blog. I will meet you soon with next stuff .Have a nice day !!!

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