Globally Unique Identifier

By Author: Dennuy
Total Articles: 129
Comment this article

A globally unique identifier free 70-291 test questions is a 128-bit hexadecimal number that is guaranteed to be unique within the enterprise. GUIDs are assigned to objects when the objects are created. The GUID never changes, even if you move or rename the object. Applications can store the GUID of an object and use the GUID to retrieve that object regardless of its current DN.
In Windows NT, each domain resource was associated with a security identifier (SID) that was generated within the domain. This meant that the SID was guaranteed to be unique only within the domain. A GUID is unique across all domains, meaning that you can move objects from domain to domain and they will still have a unique identifier.
Each user account has a "friendly" name, known as the user principal name (UPN). The UPN consists of a user account name (sometimes referred to as the user logon name} and a domain name identifying the domain in which the user account is located.

Every object in Active Directory has a distinguished name (DN) that uniquely identifies the object and contains sufficient ...
... information for a client to retrieve the object from the directory. The DN includes the name of the domain that holds the object, as well as the complete path through the container hierarchy to the object. For example, the follow?ing DN identifies the user object Scott Cooper in the Microsoft exam 70-291 domain:
CN=Scott Cooper,OU=Promoti ons,OU=Marketing,DC=Mi crosoft,DC=Com
In the DN, three LDAP abbreviations, CN, OU, and DC, are used for the naming attribute. CN indicates the object's common name, OU indicates the organizational unit name, and DC indicates the domain component name. DNs must be unique, because Active Directory does not allow duplicate DNs.
Active Directory supports querying by attributes, so you can locate an object even if the exact DN is unknown or has changed. The relative distinguished name (RON) of an object is the part of the name that is an attribute of the object itself. In the preceding example, the RDN of the Scott Cooper user object is Scott Cooper. The RDN of the parent object is Promotions.
Active Directory does not display the LDAP abbreviations for the naming attributes common name (CN), organizational unit (OU), and domain component (DC). These abbreviations are shown here only to illustrate how LDAP recognizes the portions of the distinguished name. Most Active Directory tools display object names in canonical form, which lists the RDNs from the Free A+ practice exams, or the DNS domain name, downwards.