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it is the user because you can not expand it


A leaf object cannot contain other objects and usually refers to a resource such as a printer, folder, user or group

User
Domain, user, printer ,ou folder or site

Objects are either container objects or leaf objects. A container object stores other objects and it occupies a specific level in a subtree hierarchy.

An object class is a container if at least one other class specifies it as a possible superior; therfore any object class defined in the schema can become a container. A leaf objectdoes not store other objects, and, as such, it occupies the endpoint of a subtree

a directory service is essentially a container that can contain other containers. This is certainly true of AD. Objects in Active Directory can be either containers for other objects or they can be leaf objects, which do not serve as containers. A user object is an example of a leaf object because it stores user data but does not contain other objects.

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Objects are either container objects or leaf objects. A container object stores other objects and it occupies a specific level in a subtree hierarchy. An object class is a container if at least one other class specifies it as a possible superior; therfore any object class defined in the schema can become a container. A leaf object does not store other objects, and, as such, it occupies the endpoint of a subtree a directory service is essentially a container that can contain other containers. This is certainly true of AD. Objects in Active Directory can be either containers for other objects or they can be leaf objects, which do not serve as containers. A user object is an example of a leaf object because it stores user data but does not contain other objects.

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Q: Which of the follwing items is a valid leaf object in Active Directory?
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Windows 2000 Active Directory data store, the actual database file, is \ntds\NTDS.DIT. The ntds.dit file is the heart of Active Directory including user accounts. Active Directory's database engine is the Extensible Storage Engine ( ESE ) which is based on the Jet database used by Exchange 5.5 and WINS. The ESE has the capability to grow to 16 terabytes which would be large enough for 10 million objects. Back to the real world. Only the Jet database can maniuplate information within the AD datastore.For information on domain controller configuration to optimize Active Directory, see Optimize Active Directory Disk PerformanceThe Active Directory ESE database, NTDS.DIT, consists of the following tables:Schema table the types of objects that can be created in the Active Directory, relationships between them, and the optional and mandatory attributes on each type of object. This table is fairly static and much smaller than the data table.Link table contains linked attributes, which contain values referring to other objects in the Active Directory. Take the MemberOf attribute on a user object. That attribute contains values that reference groups to which the user belongs. This is also far smaller than the data table.Data table users, groups, application-specific data, and any other data stored in the Active Directory. The data table can be thought of as having rows where each row represents an instance of an object such as a user, and columns where each column represents an attribute in the schema such as GivenName.From a different perspective, Active Directory has three types of dataSchema information definitional details about objects and attributes that one CAN store in the AD. Replicates to all domain controllers. Static in nature.Configuration information configuration data about forest and trees. Replicates to all domain controllers. Static as your forest is.Domain information object information for a domain. Replicates to all domain controllers within a domain. The object portion becomes part of Global Catalog. The attribute values (the actual bulk of data) only replicates within the domain.Although GUIDs are unique, they are large. AD uses distinguished name tag ( DNT ). DNT is a 4-byte DWORD value which is incremented when a new object is created in the store. The DNT represents the object's database row number. It is an example of a fixed column. Each object's parent relationship is stored as a parent distinguished name tag ( PDNT ). Resolution of parent-child relationships is optimized because the DNT and PDNT are indexed fields in the database. For more technical info on the AD datastore and its organization, a good starting point is the Active Directory Database Sizing document.The size of ntds.dit will often be different sizes across the domain controllers in a domain. Remember that Active Directory is a multi-master independent model where updates are occuring in each of the ADs with the changes being replicated over time to the other domain controllers. The changed data is replicated between domain controllers, not the database, so there is no guarantee that the files are going to be the same size across all domain controllers.Active Directory routinely performs online database defragmentation, but this is limited to the disposal of tombstoned objects. The database file cannot be compacted while Active Directory is mounted. An ntds.dit file that has been defragmented offline ( compacted ), can be much smaller than the ntds.dit file on its peers. To defrag ntds.dit offline:Back up the Active Directory using Windows 2000 Backup. W2K backup natively supports backing up Active Directory while online. This occurs automatically when you select the option to back up everything on the computer in the Backup Wizard, or independently by selecting to back upSystem State in the backup wizard.RebootSelect the appropriate installation from the boot menu, and press F8 to display the Windows 2000 Advanced Options menu.Choose Directory Services Restore Mode and press ENTER. Press ENTER again to start the boot process.Logon using the password defined for the local Administrator account in the offline SAM.Click Start, Programs, Accessories, and then click Command Prompt.At the command prompt, run the ntdsutil command.When ntdsutil has started Type files and press ENTER.Type info and then press ENTER. This will display current information about the path and size of the Active Directory database and its log files.Type compact to drive:\directory, and press ENTER. Be sure that the drive specified has enough drive space for the compacted database to be created. I know, you don't know how big the compacted version will be, but if there is enough space for the uncompacted version, you should be OK. A gotcha!: You must specify a directory path and if the path name has spaces, the command will not work unless you use quotation marks compact to "c:\my new folder"Type quit and press Enter.Type quit and press Enter to return to the command prompt. A new compacted database named Ntds.dit can be found in the folder you specified.Copy the new ntds.dit file over the old ntds.dit file. You have successfully compacted the Active Directory database. If you believe in belts and suspenders, I would copy the old uncompacted database somewhere else before I overwrote it with the new compacted version.Reboot and see if all is normal.This is a server by server task. Monitor the size of ntds.dit and if it starts growing and performance is slow and you can not see why either situation should apply, consider offline defrags.If ntds.dit gets corrupted or deleted or is missing ( can happen if the promotion process to domain controller goes bad ), you have to manually recover it using Windows 2000 Backup. Now you did do W2K backups right?:Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Click OK. This acknowledges the warning message that you are using Safe mode.Click Start, Programs, Accessories, System Tools, and then click Backup.Select the Restore tab.Click the + symbol next to the following items to expand them: FileMedia CreatedSystem DriveWinntNTDSClick the NTDS folder to display the files in the folder.Click to select the ntds.dit check box.Leave the Restore files to box set to Original Location. This check box provides the option to restore to an alternative location. If you restore to an alternative location, you will have to copy the ntds.dit file into the\ntds folder.Click Start Restore.To move a database or log file :Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Start a command prompt, and then type ntdsutil.exe .At a Ntdsutil prompt, type files.At the File Maintenance prompt To move a database, type move db to %s where %s is the drive and folder where you want the database moved.To move log files, type move logs to %s where %s is the drive and folder where you want the log files moved.To view the log files or database, type info.To verify the integrity of the database at its new location, type integrity.Type quitType quit to return to a command prompt.Restart the computer in Normal mode.When you move the database and log files, you must back up the domain controller.


What is the file that is responsible for keeping all Active Directory database?

Windows 2000 Active Directory data store, the actual database file, is \ntds\NTDS.DIT. The ntds.dit file is the heart of Active Directory including user accounts. Active Directory's database engine is the Extensible Storage Engine ( ESE ) which is based on the Jet database used by Exchange 5.5 and WINS. The ESE has the capability to grow to 16 terabytes which would be large enough for 10 million objects. Back to the real world. Only the Jet database can maniuplate information within the AD datastore.For information on domain controller configuration to optimize Active Directory, see Optimize Active Directory Disk PerformanceThe Active Directory ESE database, NTDS.DIT, consists of the following tables:Schema table the types of objects that can be created in the Active Directory, relationships between them, and the optional and mandatory attributes on each type of object. This table is fairly static and much smaller than the data table.Link table contains linked attributes, which contain values referring to other objects in the Active Directory. Take the MemberOf attribute on a user object. That attribute contains values that reference groups to which the user belongs. This is also far smaller than the data table.Data table users, groups, application-specific data, and any other data stored in the Active Directory. The data table can be thought of as having rows where each row represents an instance of an object such as a user, and columns where each column represents an attribute in the schema such as GivenName.From a different perspective, Active Directory has three types of dataSchema information definitional details about objects and attributes that one CAN store in the AD. Replicates to all domain controllers. Static in nature.Configuration information configuration data about forest and trees. Replicates to all domain controllers. Static as your forest is.Domain information object information for a domain. Replicates to all domain controllers within a domain. The object portion becomes part of Global Catalog. The attribute values (the actual bulk of data) only replicates within the domain.Although GUIDs are unique, they are large. AD uses distinguished name tag ( DNT ). DNT is a 4-byte DWORD value which is incremented when a new object is created in the store. The DNT represents the object's database row number. It is an example of a fixed column. Each object's parent relationship is stored as a parent distinguished name tag ( PDNT ). Resolution of parent-child relationships is optimized because the DNT and PDNT are indexed fields in the database. For more technical info on the AD datastore and its organization, a good starting point is the Active Directory Database Sizing document.The size of ntds.dit will often be different sizes across the domain controllers in a domain. Remember that Active Directory is a multi-master independent model where updates are occuring in each of the ADs with the changes being replicated over time to the other domain controllers. The changed data is replicated between domain controllers, not the database, so there is no guarantee that the files are going to be the same size across all domain controllers.Active Directory routinely performs online database defragmentation, but this is limited to the disposal of tombstoned objects. The database file cannot be compacted while Active Directory is mounted. An ntds.dit file that has been defragmented offline ( compacted ), can be much smaller than the ntds.dit file on its peers. To defrag ntds.dit offline:Back up the Active Directory using Windows 2000 Backup. W2K backup natively supports backing up Active Directory while online. This occurs automatically when you select the option to back up everything on the computer in the Backup Wizard, or independently by selecting to back upSystem State in the backup wizard.RebootSelect the appropriate installation from the boot menu, and press F8 to display the Windows 2000 Advanced Options menu.Choose Directory Services Restore Mode and press ENTER. Press ENTER again to start the boot process.Logon using the password defined for the local Administrator account in the offline SAM.Click Start, Programs, Accessories, and then click Command Prompt.At the command prompt, run the ntdsutil command.When ntdsutil has started Type files and press ENTER.Type info and then press ENTER. This will display current information about the path and size of the Active Directory database and its log files.Type compact to drive:\directory, and press ENTER. Be sure that the drive specified has enough drive space for the compacted database to be created. I know, you don't know how big the compacted version will be, but if there is enough space for the uncompacted version, you should be OK. A gotcha!: You must specify a directory path and if the path name has spaces, the command will not work unless you use quotation marks compact to "c:\my new folder"Type quit and press Enter.Type quit and press Enter to return to the command prompt. A new compacted database named Ntds.dit can be found in the folder you specified.Copy the new ntds.dit file over the old ntds.dit file. You have successfully compacted the Active Directory database. If you believe in belts and suspenders, I would copy the old uncompacted database somewhere else before I overwrote it with the new compacted version.Reboot and see if all is normal.This is a server by server task. Monitor the size of ntds.dit and if it starts growing and performance is slow and you can not see why either situation should apply, consider offline defrags.If ntds.dit gets corrupted or deleted or is missing ( can happen if the promotion process to domain controller goes bad ), you have to manually recover it using Windows 2000 Backup. Now you did do W2K backups right?:Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Click OK. This acknowledges the warning message that you are using Safe mode.Click Start, Programs, Accessories, System Tools, and then click Backup.Select the Restore tab.Click the + symbol next to the following items to expand them: FileMedia CreatedSystem DriveWinntNTDSClick the NTDS folder to display the files in the folder.Click to select the ntds.dit check box.Leave the Restore files to box set to Original Location. This check box provides the option to restore to an alternative location. If you restore to an alternative location, you will have to copy the ntds.dit file into the\ntds folder.Click Start Restore.To move a database or log file :Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Start a command prompt, and then type ntdsutil.exe .At a Ntdsutil prompt, type files.At the File Maintenance prompt To move a database, type move db to %s where %s is the drive and folder where you want the database moved.To move log files, type move logs to %s where %s is the drive and folder where you want the log files moved.To view the log files or database, type info.To verify the integrity of the database at its new location, type integrity.Type quitType quit to return to a command prompt.Restart the computer in Normal mode.When you move the database and log files, you must back up the domain controller.


What is the file that's responsible for keeping all active Directory database?

Windows 2000 Active Directory data store, the actual database file, is \ntds\NTDS.DIT. The ntds.dit file is the heart of Active Directory including user accounts. Active Directory's database engine is the Extensible Storage Engine ( ESE ) which is based on the Jet database used by Exchange 5.5 and WINS. The ESE has the capability to grow to 16 terabytes which would be large enough for 10 million objects. Back to the real world. Only the Jet database can maniuplate information within the AD datastore.For information on domain controller configuration to optimize Active Directory, see Optimize Active Directory Disk PerformanceThe Active Directory ESE database, NTDS.DIT, consists of the following tables:Schema table the types of objects that can be created in the Active Directory, relationships between them, and the optional and mandatory attributes on each type of object. This table is fairly static and much smaller than the data table.Link table contains linked attributes, which contain values referring to other objects in the Active Directory. Take the MemberOf attribute on a user object. That attribute contains values that reference groups to which the user belongs. This is also far smaller than the data table.Data table users, groups, application-specific data, and any other data stored in the Active Directory. The data table can be thought of as having rows where each row represents an instance of an object such as a user, and columns where each column represents an attribute in the schema such as GivenName.From a different perspective, Active Directory has three types of dataSchema information definitional details about objects and attributes that one CAN store in the AD. Replicates to all domain controllers. Static in nature.Configuration information configuration data about forest and trees. Replicates to all domain controllers. Static as your forest is.Domain information object information for a domain. Replicates to all domain controllers within a domain. The object portion becomes part of Global Catalog. The attribute values (the actual bulk of data) only replicates within the domain.Although GUIDs are unique, they are large. AD uses distinguished name tag ( DNT ). DNT is a 4-byte DWORD value which is incremented when a new object is created in the store. The DNT represents the object's database row number. It is an example of a fixed column. Each object's parent relationship is stored as a parent distinguished name tag ( PDNT ). Resolution of parent-child relationships is optimized because the DNT and PDNT are indexed fields in the database. For more technical info on the AD datastore and its organization, a good starting point is the Active Directory Database Sizing document.The size of ntds.dit will often be different sizes across the domain controllers in a domain. Remember that Active Directory is a multi-master independent model where updates are occuring in each of the ADs with the changes being replicated over time to the other domain controllers. The changed data is replicated between domain controllers, not the database, so there is no guarantee that the files are going to be the same size across all domain controllers.Active Directory routinely performs online database defragmentation, but this is limited to the disposal of tombstoned objects. The database file cannot be compacted while Active Directory is mounted. An ntds.dit file that has been defragmented offline ( compacted ), can be much smaller than the ntds.dit file on its peers. To defrag ntds.dit offline:Back up the Active Directory using Windows 2000 Backup. W2K backup natively supports backing up Active Directory while online. This occurs automatically when you select the option to back up everything on the computer in the Backup Wizard, or independently by selecting to back upSystem State in the backup wizard.RebootSelect the appropriate installation from the boot menu, and press F8 to display the Windows 2000 Advanced Options menu.Choose Directory Services Restore Mode and press ENTER. Press ENTER again to start the boot process.Logon using the password defined for the local Administrator account in the offline SAM.Click Start, Programs, Accessories, and then click Command Prompt.At the command prompt, run the ntdsutil command.When ntdsutil has started Type files and press ENTER.Type info and then press ENTER. This will display current information about the path and size of the Active Directory database and its log files.Type compact to drive:\directory, and press ENTER. Be sure that the drive specified has enough drive space for the compacted database to be created. I know, you don't know how big the compacted version will be, but if there is enough space for the uncompacted version, you should be OK. A gotcha!: You must specify a directory path and if the path name has spaces, the command will not work unless you use quotation marks compact to "c:\my new folder"Type quit and press Enter.Type quit and press Enter to return to the command prompt. A new compacted database named Ntds.dit can be found in the folder you specified.Copy the new ntds.dit file over the old ntds.dit file. You have successfully compacted the Active Directory database. If you believe in belts and suspenders, I would copy the old uncompacted database somewhere else before I overwrote it with the new compacted version.Reboot and see if all is normal.This is a server by server task. Monitor the size of ntds.dit and if it starts growing and performance is slow and you can not see why either situation should apply, consider offline defrags.If ntds.dit gets corrupted or deleted or is missing ( can happen if the promotion process to domain controller goes bad ), you have to manually recover it using Windows 2000 Backup. Now you did do W2K backups right?:Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Click OK. This acknowledges the warning message that you are using Safe mode.Click Start, Programs, Accessories, System Tools, and then click Backup.Select the Restore tab.Click the + symbol next to the following items to expand them: FileMedia CreatedSystem DriveWinntNTDSClick the NTDS folder to display the files in the folder.Click to select the ntds.dit check box.Leave the Restore files to box set to Original Location. This check box provides the option to restore to an alternative location. If you restore to an alternative location, you will have to copy the ntds.dit file into the\ntds folder.Click Start Restore.To move a database or log file :Reboot the domain controller and press F8 to display the Windows 2000 Advanced Options menu.Select Directory Services Restore Mode and then press ENTER.Select the correct installation, and then press ENTER to start the boot process.Logon using the administrator account and password you specified during the promotion process. When you ran Dcpromo.exe to install Active Directory, it requested a password to be used for the Administrator password for Active Directory Restore Mode. This password is not stored in Active Directory. It is stored in an NT4-style SAM file and is the only account available when the AD is corrupted.Start a command prompt, and then type ntdsutil.exe .At a Ntdsutil prompt, type files.At the File Maintenance prompt To move a database, type move db to %s where %s is the drive and folder where you want the database moved.To move log files, type move logs to %s where %s is the drive and folder where you want the log files moved.To view the log files or database, type info.To verify the integrity of the database at its new location, type integrity.Type quitType quit to return to a command prompt.Restart the computer in Normal mode.When you move the database and log files, you must back up the domain controller.


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