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we have resource forest and account forest set up.<br />
<br />
in resource forest we have exchange domains having disabled AD accounts where users are linked to their account forest through linked master attribute to their account forest .( linked mailboxes)<br />
<br />
we have several AD sites . &nbsp;giving an example.<br />
<br />
A) ABC. LAN is one resource domain &nbsp;in NY &nbsp;and ABE.lan, is another resource domain in separate AD site. (SEATLLE)<br />
<br />
each site has its own DC. <br />
<br />
My question:<br />
<br />
A)I see in AD DOMAINS AND TRUSTS &nbsp;that trust relationship between &nbsp;ABC. LAN resource domain side that with ABE. LAN is forest relationship <br />
B) When I check from account forest side , let us say from ABE.COM(DC) &nbsp;TO ABE.COM(dc) it shows they are having external relationship.<br />
between their respective DC'S<br />
<br />
So from resource forest side it is forest and from account forest side it is external, kind of confused.<br />
<br />
can somebody explain the difference
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we have resource forest and account forest set up.

in resource forest we have exchange domains having disabled AD accounts where users are linked to their account forest through linked master attribute to their account forest .( linked mailboxes)

we have several AD sites .  giving an example.

A) ABC. LAN is one resource domain  in NY  and ABE.lan, is another resource domain in separate AD site. (SEATLLE)

each site has its own DC. 

My question:

A)I see in AD DOMAINS AND TRUSTS  that trust relationship between  ABC. LAN resource domain side that with ABE. LAN is forest relationship 
B) When I check from account forest side , let us say from ABE.COM(DC)  TO ABE.COM(dc) it shows they are having external relationship.
between their respective DC'S

So from resource forest side it is forest and from account forest side it is external, kind of confused.

can somebody explain the difference

EXCHANGE, ACTIVE DIRECTORY

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.