You administer two Microsoft SQL Server 2012 servers. Each server resides in a different, untrusted
domain.
You plan to configure database mirroring.
You need to be able to create database mirroring endpoints on both servers.
What should you do?
A.
Configure the SQL Server service account to use Network Service.
B.
Use a server certificate.
C.
Use a database certificate.
D.
Configure the SQL Server service account to use Local System.
B
http://msdn.microsoft.com/en-us/library/cc917681.aspx
“We tested database mirroring between two remote database servers—one in Redmond, Washington, and the other in Charlotte, North Carolina. The two database servers are in different and untrusted domains. To establish database mirroring between untrusted domains, certificates are required to authenticate connection requests. Certificates have no impact on performance and provide a secured way of authenticating database mirroring connections. On each server (principal, mirror, and witness), the endpoint is configured with a locally created certificate. Then the certificates are copied to the other servers.”
Feb 18 2016: Database Mirroring was removed from the 70-462 exam section “Implementing High Availability”.
https://www.microsoft.com/en-ca/learning/exam-70-462.aspx (last paragraph has a link to a Word doc with the details)