AD replication query

jasonwatts1972 used Ask the Experts™

We are running Exchange 2010. Our AD topology for site links is as below:

All of the three below are AD sites configured in AD Sites and Services

New York -- Los Angeles -- Miami

That is:

NY-LA: Cost 10
LA-Miami: Cost 10

There is site link between NY and Miami.

Each AD site has Exchange 2010 Mailbox servers, Hub and CAS servers.

How does this relate to Exchange routing? If an email was sent from a NY user to  Miami user, would the email go straight from NY Hub > Miami Hub? Or, because there is no AD Site link between NY and Miami, does it go via the LA Hub server?

I know that it's possible to configure Exchange costs on AD site links, but is it possible to create an Exchange site link purely for mail routing purposes?
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Exchnage Connectors and AD replication schedules are independent and can be configured seperately see

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