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<p>Could you please support with an example..</p>
A child domain controller is a sub domain like
www.microsoft.com and www.tech.microsoft.com, tech.microsoft.com is a sub domain in microsoft.com.
ADC is a replica of a domain controller for better performance and high availaibility, which can be act as a domain controller in certain circumstances.
A child domain controller creates a subdomain in your active directory tree. This is used as a security feature so a group of users can have separate policies and limited or controlled access to the parent domain resources.
An additional domain controller adds a secondary domain controller to the domain. It’s recommended to have at least2 domain controllers per domain to take advantage of the high availability features of Active Directory.
thanks
no difference