You need to identify all failed logon attempts on the domain controllers.    
What should you do（）

单项选择题A domain controller named DC12 runs critical services. Restructuring of the organizational unit  hierarchy for the domain has been completed and unnecessary objects have been deleted.     You need to perform an offline defragmentation of the Active Directory database on DC12.  You  also need to ensure that the critical services remain online.     What should you do（）

A.Start the domain controller in the Directory Services restore mode. Run the Defrag utility.  
B.Start the domain controller in the Directory Services restore mode. Run the Ntdsutil utility.
C.Stop the Domain Controller service in the Services （local） Microsoft Management Console （MMC）. Run the Defrag
D.Stop the Domain Controller service in the Services （local） Microsoft Management Console （MMC）. Run the Ntdsutil

单项选择题You network consists of a single Active Directory domain. All domain controllers run Windows  Server 2008 R2.     You need to reset the Directory Services Restore Mode （DSRM） password on a domain  controller.     What tool should you use（）

A.dsmod
B.ntdsutil
C.Local Users and Groups snap-in
D.Active Directory Users and Computers snap-in

单项选择题Your company has a domain controller server that runs the Windows Server 2008 R2 operating  system. The server is a backup server. The server has a single 500-GB hard disk that has three  partitions for the operating system， applications， and data. You perform daily backups of the  server.     The hard disk fails. You replace the hard disk with a new hard disk of the same capacity. You  restart the computer on the installation media. You select the Repair your computer option.     You need to restore the operating system and all files.     What should you do（）

A.Select the System Image Recovery option.
B.Run the Imagex utility at the command prompt.
C.Run the Wbadmin utility at the command prompt.
D.Run the Rollback utility at the command prompt.

单项选择题Your company has an Active Directory domain that runs Windows Server 2008 R2. The Sales OU  contains an OU for Computers， an OU for Groups， and an OU for Users.   You perform nightly backups. An administrator deletes the Groups OU. You need to restore the  Groups OU without affecting users and computers in the Sales OU.     What should you do（）

A.Perform an authoritative restore of the Sales OU.
B.Perform an authoritative restore of the Groups OU.
C.Perform a non-authoritative restore of the Groups OU.
D.Perform a non-authoritative restore of the Sales OU.

单项选择题You have a domain controller that runs Windows Server 2008 R2. The Windows Server Backup  feature is installed on the domain controller.   You need to perform a non-authoritative restore of the domain controller by using an existing  backup file.     What should you do（）

A.Restart the domain controller in Directory Services Restore Mode. Use the WBADMIN command to perform a critica
B.Restart the domain controller in Directory Services Restore Mode. Use the Windows Server Backup snap-in to perf
C.Restart the domain controller in safe mode. Use the Windows Server Backup snap-in to perform a critical volume re
D.Restart the domain controller in safe mode. Use the WBADMIN command to perform a critical volume restore.