You have an Exchange Server 2013 organization that contains the servers configured as shown in the following
table.
All of the Exchange servers run Windows Server 2012 R2 and are members of a database availability group
(DAG) named DAG1. Each server has a copy of all the mailbox databases.
DAG1 is configured to have a cluster administrative access point. The file share witness is located in Site A.
You need to identify the maximum number of Mailbox servers that can fail simultaneously without affecting the
mailbox access of the users.
How many servers should you identify?
A.
2
B.
3
C.
4
D.
5
Explanation:
Example: Quorum requires a majority of voters to be able to communicate with each other. Consider a DAG
that has four members. Because this DAG has an even number of members, an external witness server is
used to provide one of the cluster members with a fifth, tie-breaking vote. To maintain a majority of voters (and
therefore quorum), at least three voters must be able to communicate with each other. At any time, a maximum
of two voters can be offline without disrupting service and data access. If three or more voters are offline, the
DAG loses quorum, and service and data access will be disrupted until you resolve the problem.
Database availability groups
https://technet.microsoft.com/en-us/library/dd979799%28v=exchg.150%29.aspx