Adding a Child Domain, Creating Sites and Subnets, and Configuring Replication with the Mother Ship in Server 2008

Here we have globamantics.com DC in Newyork and we will create a child domain (Sub-domain) in Chicago.

There's a good reason to break out Chicago into its own child domain:

*Less Network Traffic to suck up your bandwidth between Chicago and New York.
*De-centralized management will you to delegate control over Chicago to an administrator.
*Having a location - centric AD structure can allow for easier tracking of stuff between locations.

Adding a Site and Subnet Before Jumping In:

Before we begin:

*Sites in AD represent the physical structure, or toplogy, of your network.
*Right now, we have only one site defined in Globomantics.com, Netwyork. We first need to create the chicago site in AD sites and services.
*In order to allow AD the ability to track our machines by location, we'll also create a subnet object as well, and assign that subnet object to Chicago.
*Once that's done, we can use the location Attribute in AD to track and find machines according to their IP address.
*Here's what we have and what we're going to create:

How to create a Site:
Open AD sites and services > Select Sites > Right click > New Site > Give the Site name Ex : Chicago  and Select DEFAULTIPSITELINK >Then click on OK. > Then you will be prompted with that Site Chicago has been created > OK.



To create a New subnet 

Open AD Sites and Services > Sites > Subnets > Right click New Subnet > In the prefix you need to type the IP address Ex : 192.168.5.0/26 and Select Chicago  and click on OK


Now Under Subnets you can see a Subnet created with 192.168.5.0/26

Now we need to install Child domain so we need install AD domain services and Active directory in Chicago computer.
While installation of AD > Select Create a New domain in an Existing forest  > Next > Type the name of the Domain Ex : Globmantics.com (DC1) > Next > Now it will search for Globmantics.com in Network > Now you to type the FQDN of the Parent domain so Browse and select the Domain , Under single Lable DNS name of the Child domain Ex : NA (Then it will show as na.globamantics.com)> Next > Then you  will  be prompted to Select the IP address which is corresponds to this Site, Select Chicago (Remove check mark)  
 

> Next > Select DNS, Global Catalog > Next > Database file, sysvol, logs location > Next > password > export settings (If needed) > Next. AD will be installed.

When you open AD sites and Services, you can Chicago server is added by default under Chicago Site. 

Chicago NTDS settings > Properties> In general Tab, you can configure Replication Server Ex: Now its replicating from DC1, you can change it to DC2 or DC3. Also you can schedule the replication timings by  clicking on Schedule.
 

Once you have completed with above process, you can login into any domain by just logging into AD users and computers> domain.com > Right click> Change domain> browse and select domain.

*Child Domain -  A subdomain that is part of the main Forest useful for delegation of management, location based management and saving bandwidth over WAN links.
*Site - An AD object that represents the major components of the physical topology of a network.
*Subnet Object - An AD object that allows AD to track machines based on IP address.