HOTSPOT
Your network contains two Active Directory sites named Site1 and Site2.
You have an Exchange Server 2013 organization that contains six servers. The servers are configured
as shown in the following table.
All of the mailbox databases replicate to all of the servers.
Users in Site1 connect to sitel-mail.contoso.com to access their mailbox. Users in Site2 connect to
site2-mail.contoso.com to access their mailbox. All of the users use Microsoft Outlook 2013.
You need to identify which DNS modification must be made to fail over the email services from Site1
to Site2.
Which DNS modification should you identify? (To answer, select the appropriate record to modify
and the new data for the record in the answer area.)
Answer: 
The question asks about site 1 failing over to site 2, all users in site 1 user site1-mail.contoso.com, so we would need to create a new record for site1-mail.contoso.com that points to site 2 (the load balancer address)