Exchange DAG IP

I have been working and testing Exchange 2013 HA with DAGS while learning Windows 2012 Dynamic Clustering.  One question I can't seem to answer is what type of traffic goes over the DAG IP?   In testing I can have the dag "off-line" yet the databases can still sync up.  

So what type of traffic actually goes across this DAG IP?  I know this IP is tied to a Computer Name of the Dag - but what does actually do?

If the "active" dag ip is online in the DR site, yet our active Exchange 2013 mailboxes our mounted in the primary site, what type of issues, (or traffic issues) does this cause?
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iowasolutionsAsked:
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Mahesh SharmaConnect With a Mentor Commented:
The name, IP addresses, and CNO for the cluster are used only internally by the system to secure the DAG and for internal communication purposes. Administrators and end users don't need to interface with or connect to the DAG name or IP address for any reason.

Ref: http://technet.microsoft.com/en-us/library/dd979799.aspx
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