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
exchangeAB Use this SPN for the Address Book service.
exchangeMDB Use this SPN for RPC Client Access.
exchangeRFR Use this SPN for the Address Book service.
HTTP Use this SPN for Exchange Web Services, Offline Address Book downloads, and the Autodiscover service.
Exchange 2010 will continue to retain the exchangeMDB, ExchangeRFR, and ExchangeAB SPN records, but will lose the HTTP records as they will move to the Exchange 2013.
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
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