You need to prevent an automatic failover of DAG1 if the WAN link between the two sites fails but the servers in both sites are still running

HOTSPOT
Your company has a main office and a disaster recovery site. An Active Directory site named
MainSite exists for the main office. An Active Directory site named DRSite exists for the disaster
recovery site. The two sites connect to each other by using a WAN link. All users work in the main
office.
You have an Exchange Server 2013 organization. The organization contains six servers. The servers
are configured as shown in the following table.

All of the Mailbox servers are members of a database availability group (DAG) named DAG1. After a
WAN link failure, you discover that all of the active mailbox database copies are located on MBX3,
even though MBX1 and MBX2 are still running.
You need to prevent an automatic failover of DAG1 if the WAN link between the two sites fails but
the servers in both sites are still running. The solution must prevent two active copies of the same
database. What should you do? (To answer, select the appropriate options in the answer area.)


HOTSPOT
Your company has a main office and a disaster recovery site. An Active Directory site named
MainSite exists for the main office. An Active Directory site named DRSite exists for the disaster
recovery site. The two sites connect to each other by using a WAN link. All users work in the main
office.
You have an Exchange Server 2013 organization. The organization contains six servers. The servers
are configured as shown in the following table.

All of the Mailbox servers are members of a database availability group (DAG) named DAG1. After a
WAN link failure, you discover that all of the active mailbox database copies are located on MBX3,
even though MBX1 and MBX2 are still running.
You need to prevent an automatic failover of DAG1 if the WAN link between the two sites fails but
the servers in both sites are still running. The solution must prevent two active copies of the same
database. What should you do? (To answer, select the appropriate options in the answer area.)


Answer:

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DD

DD

This is a little confusing to me

The explanation for DAC is:
https://technet.microsoft.com/en-us/library/dd979790(v=exchg.150).aspx

But this seems to only involve a bit that is set on the Exchange server on startup so I don’t see how that would come into play here since it was a WAN link failure. Am I just overlooking that since the primary witness server is CAS1 they will be behave better?

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