Similarly, the term, Non-Internet Facing AD Site, simply means any Active Directory site containing Exchange servers whose virtual directories do not have ExternalURL property populated. Note: The term, Internet Facing AD Site, simply means any Active Directory site containing Exchange servers whose virtual directories have the ExternalURL property populated. This site contains Exchange 2010 infrastructure. Non-Internet Facing AD Site (Site3) - This is an AD site that does not have exposure to the Internet.The primary namespace is and resolves to the CAS2010 infrastructure located within this AD site. Regional Internet Facing AD Site (Site2) - This is an AD site that has exposure to the Internet.There are two namespaces associated with this location – and resolve to the CAS2010 infrastructure. Internet Facing AD Site (Site1) - This is the main AD site in the environment and has exposure to the Internet.Existing EnvironmentĪs you can see from the above diagram, this environment contains three Active Directory sites:

To that end, this article will begin with a walk through of a deployment that consists of Exchange 2010 in a multi-site architecture and show how the connectivity changes with the introduction of Exchange 2016. Our goal with this article is to articulate the various client connectivity scenarios you may encounter in your Exchange 2016 designs.

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