How Infrastructure master works? is it related to group membership?

The Infrastructure Master is a domain controller role in Active Directory (AD) that is responsible for updating group membership information within a domain. Specifically, the Infrastructure Master is responsible for updating the member attribute of groups that contain members from other domains in the same forest.

When a user or computer account from another domain in the same forest is added or removed from a group, the change is made on the domain controller in the domain where the group is located. The Infrastructure Master is then responsible for updating the member attribute of the group to reflect the change. The Infrastructure Master does this by comparing the security identifier (SID) of the added or removed account with the global catalog, which contains a list of all SIDs in the forest. If the SID is found in the global catalog, the Infrastructure Master updates the member attribute of the group with the correct SID.

Note that the Infrastructure Master only updates the member attribute of groups that contain members from other domains in the same forest. For groups that only contain members from the same domain, the member attribute is updated directly by the domain controller where the change is made.

It’s important to note that if all domain controllers in a domain are also global catalog servers, then the Infrastructure Master role is not needed. This is because the global catalog contains all the information needed to update group membership information, including SIDs from other domains.

In summary, the Infrastructure Master is responsible for updating group membership information within a domain, specifically for groups that contain members from other domains in the same forest. By ensuring that group membership information is accurate and up-to-date, the Infrastructure Master helps to maintain the security and functionality of the AD environment.

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