The infrastructure FSMO role an active directory updates object references in the domain that point yo objects in other domains.
Updates to an object's SID and distinguished name in a cross-domain object reference must be made by the DC holding the infrastructure FSMO role. A DC that is not a server for the global catalog should hold the Infrastructure Master (IM) role (GC)
Microsoft's Active Directory has a function known as Flexible Single Master Operations (FSMO, where F can occasionally mean "floating" and is pronounced Fiz-mo) (AD).
As illustrated below, FSMO roles are scoped at either the forest or domain level and are specific to that scope.
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