what exactly "non internet facing sites" and "internet facing sites" means?

what exactly "non internet facing sites" and "internet facing sites" means?
please provide me solution with examples for both above mentioned sites.....
Thank you;
Santosh N
nsanthoshb@gmail.com
Santhosh NAsked:
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MaheshArchitectCommented:
Sites refers to AD site
when your CAS server is published to internet in given site, that site is called as internet facing site
In short AD site where CAS servers are populated with external URLs on virtual directory
Non internet facing sites:
The CAS servers and mailbox servers in site where you don't have internet connectivity
In short AD site where CAS servers are not populated with external URLs on virtual directory

If user mailbox is in mailbox server in non internet facing site, In that case internet user connects to internet facing CAS servers by default and from there connection is *proxyed* to non internet facing CAS server and eventually get connected to mailbox server in that site

in order to work with this scenario, you must keep virtual directory external URLs *empty* on non internet facing CAS servers
if you set external url to public one, connection will tries to redirect and you would never connect to CAS and mailbox in non internet facing site

look at below articles:
https://blogs.technet.microsoft.com/exchange/2015/10/28/client-connectivity-in-an-exchange-2016-coexistence-environment-with-exchange-2013/
https://blogs.technet.microsoft.com/exchange/2015/10/26/client-connectivity-in-an-exchange-2016-coexistence-environment-with-exchange-2010/
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ste5anSenior DeveloperCommented:
Context?

"facing" could mean "exposed to" or "connected to"
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
In Exchange context "internet facing sites" are those services which can be contacted via Internet, as required for receiving (SMTP) emails from other parties to your site.
A "non internet facing site" is something you can use only internally, not having to talk to "the public".
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MaheshArchitectCommented:
Responded with exact context
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