Mastering Active Directory - Second Edition

Globally unique identifiers and security identifiers

In a city or organization, there can be multiple people with the same name. But their passport number or social security number will be unique to them. So, in order to identify a person or thing accurately from a group of similar things, we need to consider the associated unique value.

In an Active Directory database, nearly 2 billion objects can be stored. How will it uniquely identify each and every object? Every time we create an object in Active Directory, it will be assigned with one or two unique values. If it is a user or group object, it will receive a globally unique identifier (GUID) and a security identifier (SID). The GUID value will be saved in the objectGUID attribute in each ...