HOTSPOT
You have an organization that has Exchange Server 2010 and Exchange Server 2013 deployed.
Half of the mailboxes are on Exchange Server 2010 servers and the other half are on Exchange
Server 2013 servers.
You plan to implement Kerberos authentication for all mailbox access.
You need to identify which Service Principal Names (SPNs) to associate with each version of
Exchange Server.
In the table below identify which SPNs to associate with each Exchange Server version.
NOTE: Make only one selection in each row.
Answer: 
Explanation:
Exchange 2013 and Exchange 2010 Coexistence with Kerberos Authentication
http://blogs.technet.com/b/exchange/archive/2015/02/20/exchange-2013-and-exchange-2010-
coexistence-with-kerberos-authentication.aspx