Domain and sub domains

So I'm building a network from scratch with Windows Server 2003 & Exchange Server 2003.  My plan is for my domains to be:

aaa:mycompany.com
bbb.mycompany.com
ccc.mycompany.com

This relates to a question I asked in the past.  So that when I setup exchange, all these networks share the same GAL.  What is the best way to achieve this?

Do I need a server setup as a root domain at mycompany.com and setup the other's as child domains?  If that is the case, is it possible to setup the root domain, and a subdomain on the same server?  I have to keep the macines I use to a minimum.  Perhaps I'm going at this wrong, and this has to do with configuring DNS differently.  

In the past I had configured 3 different domains in their own forest, but this didn't allow me to share their GAL.  Thats the ultimate goal here.  To have the 3 unique domains but all having the same GAL.

Please advise on the best way forward.
usmcguyAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

GeodashCommented:
Are your domains going to be trusted? One way, two way, etc...?

look at this article -

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26441939.html
0
usmcguyAuthor Commented:
The domains will be trusted both ways.

I've read about IIFP in the past.  But is it the best way to go?  I was thinking that if you built your forest/domain correctly, you wouldn't need to go that route.  Am I wrong?  If not, the piece I'm missing is knowing how to setup the forest/domain correctly.  Otherwise, I would just have to setup 3 seperate forests, and use IIFP.
0
Leon FesterSenior Solutions ArchitectCommented:
You don't need IIFP.

You will be running an Active Directory forest so all domains are linked.
With Exchange 2003 you can only have one Exchange Organization in the forest.
This can be achieve simply be configuring Exchange for "Using a Single Forest Topology"

Read the following:
http://technet.microsoft.com/en-us/library/bb124972(v=exchg.65).aspx
http://technet.microsoft.com/en-us/library/aa997002(v=exchg.65).aspx
0
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

usmcguyAuthor Commented:
Yes, this is correct. But my question remains, would I need a dc at the root of the forest hosting my company.com? Or could a dc hosting one of the other domains (aaa, bbb, or ccc) also be at the root of the forest and still maintain the DNS naming convention.
I ask because I have to keep servers use at a minimum
0
Leon FesterSenior Solutions ArchitectCommented:
You need at least 1 DC for each domain.
No DC = No Authentication = No Domain

You configure DNS locally for each domain/DC
You enable DNS Zone replication to all the Domain Controllers in the forest.

Why? because AD is dependant on DNS, so ideally you want your domain to function even if other DNS servers/domains are having problems.

The easiest way you'll get to your design:
aaa:mycompany.com
bbb.mycompany.com
ccc.mycompany.com

Would be by creating the forest with a root domain and the 3 child domains. (x4 DC's)
mycompy.com
aaa:mycompany.com
bbb.mycompany.com
ccc.mycompany.com

I'm not sure what DNS naming conventions you're worried about...please elaborate.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
usmcguyAuthor Commented:
You pretty much answered my question.  I was more curious if there was a way to setup the forest without having to setup a domain at mycompany.com first.  But as I suspected, this isn't possible.  Thanks for the input!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Active Directory

From novice to tech pro — start learning today.