Critical services are running on CKD20， a domain controller. You have completed restructuring the organizational unit hierarchy for the domain and deleted the needless objects. 
What would you do to perform an offline defragmentation of the Active Directory database on CKD20 while ensuring that the critical services remain online（）

Certkiller .com has a domain controller that runs Windows Server 2008. The Certkiller .com network boosts 40 Windows Vista client machines. As an administrator at Certkiller .com， you want to deploy Active Directory Certificate service （AD CS） to authorize the network users by issuing digital certificates. 
What should you do to manage certificate settings on all machines in a domain from one main location（）