Use the DnsCmd command to create an application directory partition. 
To do this, use the following syntax:
DnsCmd ServerName /CreateDirectoryPartition FQDN of partition

• Total control of departmental security
• Control of the Schema
• Enterpriseand SchemaAdministrators nowreport directlyto the department
• Total control ofinformation published in theGlobal Catalog
• Doesnot automaticallyhaveatrust relationship with all organizations at LCIS

The following DS commands: the DS family built in utility .

1. DSmod - modify Active Directory attributes.
2. DSrm - to delete Active Directory objects.
3. DSmove - to relocate objects
4. DSadd - create new accounts
5. DSquery - to find objects that match your query attributes.
6. DSget - list the properties of an object

• The cost of administration has increased
• The complexity of DNS has greatly increased
• Com + Registration Database
• Creates islands of technologies
• Makes collaborations very difficult
• Explicit NTLM trusts are not as secure as Kerberos Trusts
• If institutional applications are rolled out that requires a schema change, each forest must perform the modifications
• The explicit trusts can be difficult to manageand troubleshoot
• The deployment of multiple forests defeats the concepts and all the benefits of directories

The PTR record is contained within the reverse lookup zone file. It provides mapping from the IP address to a name. PTR records can be automatically created when the A or AAAA is created with dynamic update. Additionally, when creating an A or AAAA record manually, you can check a box to also create the associated PTR record.