2 2-way tree-root transitive trusts

I am building 3 different forest on the same LAN. I am not going to build a forest and have parent and child trusts. NO.

Say I have forests A, B and C. Forest A/B are have a 2-way tree-root transitive trust and forests B/C also have a 2-way tree-root transitive trust.

Are users in Forest A able to access resource in forest C and vice versa? (considering the right security is provided)
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Darius GhassemCommented:
No, you must have direct trust setup for all forests. A and C can not contact each other unless they have a transitive trusts setup directly between the two.

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Cross Forest Trusts are NOT transitive. Parent/Child Doman/tree trusts are.

you might want to go through this article.

Teddy_HowardAuthor Commented:
Will i create any security or data flow concerns/issues if i trusted A/B, A/C and B/C, all 2-way tree-root transitive trusts?
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In this example, a two-way transitive forest trust exists between the forest root domains in Forest 1 and Forest 2, and another two-way transitive forest trust exists between the forest root domains in Forest 3 and Forest 2. This configuration allows:

    * Users in Forest 2 to access resources in any domain in either Forest 1 or Forest 3

    * Users in Forest 3 to access resources in any domain in Forest 2

    * Users in Forest 1 to access resources in any domain in Forest 2

This configuration does not allow users in Forest 1 to access resources in Forest 3 or vice versa. To allow users in both Forest 1 and Forest 3 to share resources, a two-way transitive trust must be created between the two forests.
Leon FesterSenior Solutions ArchitectCommented:
Everybody else above has answered your questions, but I'm curious...
Why 3 separate forests?
You'll only be increasing the amount of administration, especially considering you want to link them via trusts and have them running on the same LAN.
Teddy_HowardAuthor Commented:
For competition and government regulations.

thanks for your concern, DVT
Teddy_HowardAuthor Commented:
Thanks guys.
Leon FesterSenior Solutions ArchitectCommented:
I've worked on one of those setups before, they had a requirement that every forest is separated by firewalls as well.

I think I got most of my grey hairs on that project Good Luck!
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