You have an Exchange Server 2010 organization. The organization is authoritative for the
domain contoso.com.
You create a federated trust.
You need to ensure that federated partners can automatically locate the Client Access
servers in the organization.
What should you create from an external DNS server?

A.
an A record for autodiscover.contoso.com

B.
an A record for FederatedSharing.contoso.com

C.
an SRV record for _autodiscover._TCP._msdcs.contoso.com

D.
an SRV record for _FederatedSharing._UDP._msdcs.contoso.com

Explanation:
As mentioned in another question, this should actually be a CNAME record, according to
Technet, but I left this in here as an A record for contoso.com would need creating before
the CNAME for autodiscover.contoso.com.
The exam will only mention CNAME records though.

http://technet.microsoft.com/en-us/library/ff601760.aspx