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In active directory on the server you need to create a network admin user and any other normal users u want to have access to the domain. Then you have to add the pc to the domain using the network admin user. After this u can log on to the pc with the network admin or the other created user names.
OU stands for Organizational Unit and is a part of Windows Server Active Directory. When you add an Organizational Unit to Active Directory, this allows you to create a category for computers, or for users, or both. For example, in a high school, I may create an OU for Students and have all my student accounts within this OU, and an OU for Staff, and have all my staff accounts in this OU. Now I can apply GPO's, or Group Policy Objects, to this Organizational Unit, such as Interface controls if I want to lock down student interfaces for example. You can also configure OU's with computers in them. So for example, I may join a set of teacher computers to the Staff Computers OU within Active Directory after these machines have been joined to the domain, and then apply a Policy on that OU that says that ONLY staff accounts may log into these computers to prevent students from logging onto a staff machine.
OU's are extremely handy because you cannot apply policy objects to just a single user or computer. OU's also help keep your Active Directory structure nice and clean.
A Microsoft Windows Active Directory Domain is a directory service for a computer network. Think of it like a phonebook for all your companies computers, users, and printers to name a few. Active Directory provides a central authentication point for all users/computers in the building and controls network policies. This makes network management for multiple computers and users MUCH easier.
DNS is the primary name resolution service for Windows Server 2003. Active Directory depends on DNS for domain controller location, and DNS influences Active Directory domain naming. Thus, to fully understand Active Directory, it helps to understand how DNS acts as an integral component in the design of Active Directory.
DNS provides Active Directory with both a name resolution service for domain controller location and a hierarchical design that Active Directory leverages to provide a naming convention that can reflect organizational structure.
Typically, a DNS domain namespace deployed to accommodate the Active Directory mirrors the Active Directory domain namespace. In cases where there is an existing DNS namespace prior to Active Directory deployment, the DNS namespace is typically partitioned for Active Directory, and a DNS subdomain and delegation for the Active Directory forest root is created. Additional DNS domain names are then added for each Active Directory child domain.
DNS data is used to support the location of Active Directory domain controllers also. During or after the creation of the DNS zones used to support Active Directory domains, the zones are populated with DNS resource records that enable network hosts and services to locate Active Directory domain controllers.
Active Directory think of it has management system for all network LAN PCs in your domain. You can add users to certain enterprise groups, you can disable accounts, push and pull software application better then you can in SMS domain. I use to to clone user accounts or create new user groups. Very easy to learn. To install on Server requires a domain, DNS. If you're using Windows Server 2003 and setup the server to manage active directory all the options for the installation process will appear for installation. There are a lot of info online and in books if you need more info. There are training classing offer at MS Solutions Centers.
An application directory partition is represented by a domainDNS object with an instanceType attribute value of DS_INSTANCETYPE_IS_NC_HEAD combined with DS_INSTANCETYPE_NC_IS_WRITEABLE. This domainDNS object represents the application directory partition root (NC head), and is named similar to a regular domain partition, for example, "DC=dynamicdata,DC=fabrikam,DC=com", which corresponds to a DNS name of "dynamicdata.fabrikam.com". An application directory partition can, therefore, be instantiated anywhere a domain partition can be instantiated. There is no NetBIOS name associated with an application directory partition.
It is possible to nest application directory partitions, that is, an application directory partition can have child application directory partitions. Searches with subtree scope rooted at an application directory partition head will generate continuation references to the child application directory partitions.
An application directory partition replica can only be created on a domain controller that is running on Windows Server 2003 and later and only while the Domain-Naming FSMO role is held by a Windows Server 2003 and later domain controller. In a mixed forest that has both Windows Server 2003 domain controllers and down-level domain controllers (Windows 2000 domain controllers or Windows NT 4.0 primary domain controllers), an attempt to create an application directory partition replica on a down-level domain controller will fail.
An application directory partition also has a corresponding crossRef object in the Partitions container of the configuration partition. The crossRef can be pre-created manually before creating the domainDNS object. The pre-created crossRef object must have the attribute values shown in the following table or the partition creation will fail. If the crossRef object does not exist, the Active Directory server will create one when the application directory partition is created.