organizational units
A Domain.
Many times this is because the resources are part of a Windows Domain. Domains have strict security capabilities that will lock computers not part of the domain out. You can have your machine physically on the same network, but not part of the domain, and if that is the case, you will not be able to use domain resources. Ask your tech support goons to either add your machine to the domain, ensure that your current user login is a domain user, and make sure that your password has not expired.
A workgroup is 10 PCs or less, used for home or small business, each computer works independent, there is no centralized control of resources. A Domain is more than 10 computers, Microsoft recommends that you use a domain controller running a network operating system such a Windows Server 2003 to control network resources. or a domain provides centralized control
the advantage of the network is see all computers in one hub
domain account
domain account
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Domain Controller it is Microsoft Windows Server 2000/2003 directory server that provides access controls over users, accounts, groups, computers and other network resources. Domain Controller authenticate users and maintains directory services and the security database for a domain. without ADS it is not possible.
In a Workgroup:All computers are peers; no computer has control over another computer.Each computer has a set of user accounts. To use any computer in the workgroup, you must have an account on that computer.There are typically no more than ten to twenty computers.All computers must be on the same local network or subnetwork.In a Domain:One or more computers are servers. Network administrators use servers to control the security and permissions for all computers on the domain. This makes it easy to make changes because the changes are automatically made to all computers.If you have a user account on the domain, you can log on to any computer on the domain without needing an account on that computer.There can be hundreds or thousands of computers.The computers can be on different local networks.
the Domain is called as the security boundary with in the active directory. A Windows domain is a logical group of computers running versions of the Microsoft Windows operating system that share a central directory database. domain governs the way user access resources of the network
adhoc basically means "thrown together". In the terms of a network it means the computers may not be related together by network name or domain name.
Active Directory service is used to store information about the network resources across a domain and also centralize the network.