what does global caterlog server mean
The Global Catalog server is the domain controller that stores a full copy of all objects in its host domain. It also stores a partial copy of all objects in all other domains within the forest.n order for Global Catalog servers to store a full copy of all objects in its host domain and a partial copy of all objects in all other domains within the forest, GC replication has to occur between those domain controllers that are configured as GC servers.