If any difference between DC and ADC? ADC will having any FSMO roles and AD will be stored locally on ADC?

It would help if you were to define what your abbreviations mean.  From the context, I am assuming that by 'DC' you mean domain controller.  Not sure what you mean by ADC.  From the context I will assume you are asking about multiple domain controllers.  If I am wrong, please provide more information.

Active Directory has a multi-master model.  This means that any domain controller in a domain contains all the information required for Active Directory and is stored locally.  Changes can be made to any domain controller and they will automatically be replicated to all other domain controllers.  There is no 'master' or 'primary' or 'alternate' or 'backup' roles.  They all participate equally in the domain.

As you note, there are special FSMO roles.  By default these are installed on the first domain controller installed in a domain.  They can be moved to any other domain controller in the domain.

In an Active Directory environment you can have Domain Controllers. (DCs) These servers are equiped with the Active Directory Domain Services role and the Active Directory Domain Services management tools. Admins of these servers have run dcpromo to promote the server to a Domain Controller. Domain Controllers host the Active Directory Domain Servers database, allow connections to this database, take care of replication and host the SYSVOL and NETLOGON shares.
   
People tend to think in terms of the first Domain Controller and additional Domain Controllers (ADCs), but in fact there might not be a difference between these Domain Controllers. The first Domain Controller by default is a Global Catalog (GC) and holds all five FSMO roles. You can make ADCs Global Catalogs as well and you can transfer FSMO roles between Domain Controllers.
   
Member servers are domain joined Windows servers. The main difference between Domain Controllers and member servers is the place where authentication takes place. A Domain Controller authenticates against the Active Directory database (unless running in DSRM), where a member server can authenticate against both the Active Directory database and the local account database. Member servers do not host any Active Directory Domain services.
   
And then there are workgroup-joined computers. These are non-Active Directory Domain joined servers. This is the default state of a Windows Server (after installation from non-customized installation media).
   

Hi raveena-tandon,

The First Domain Controller (DC) and additional Domain Controllers (ADCs), but in fact there is no difference between these Domain Controllers. The first Domain Controller by default is a Global Catalog (GC) and holds all five FSMO roles. You can make ADCs Global Catalogs as well and you can transfer FSMO roles between Domain Controllers. Functionality wise there is no difference.

Have a look into this article: FSMO placement and optimization on Active Directory domain controllers

https://support.microsoft.com/en-us/kb/223346/en-us

Best Regards,

Mary Dong

Thanks additional domain controllers may stores locally Active Directory database? or it needs to connect root or first DC? scenario i have created  user in additional domain controllers so additional Domain controllers stores AD database and during replication intervals  it will transfer to first DC? meaning additional DC having local Active Directory database?

Hi raveena-tandon,

When it says additional it just means another domain controller.  All AD DC's are equal in terms of power.  None of them are greater then one another apart from one will hold FSMO roles.

Domain Controllers host the Active Directory Domain Servers database, allow connections to this database, take care of replication. Whenever any change happens in the AD object, its usn changes on that very Domain controller. This DC notifies its replication partners of the change. In your scenario, changes happen in additional DC, as a result, PDC pull the updates from the ADC. It should be noted that only changes on the ADC are replicated.

Best Regards,

Mary Dong

Thanks meaning additional domain controllers may stores locally Active Directory database?

Yes it is. but the FSMO role still exist on primary domain controller by default, until you transfer those roles to anothe

Raveena-Tandon,

I see many posts in this forum from you that are asking pretty basic questions about Active Directory.  Many, if not all, of the questions can be answered by reading TechNet or picking up one of many books on the topic of Active Directory.  Mark Minasi has been writing very readable books on Windows since its inception.  Pick up his "Mastering Windows Server 2012 R2" book and you will find you will be well on the road to understanding things b

HI,

Yes you can use the book for this