You have an Exchange Server 2010 organization.You plan to enable Federated Sharing.You need to create a DNS record to store the Application Identifier （AppID） of the domain for the federated trust.
Which type of record should you create？（）

You have an Exchange Server 2010 organization.Users report that they can share free/busy information with users at a federated partner， but they cannot share contacts with those users. You need to ensure that your users can share contacts with users at the federated partner. 
What should you modify？（）

You have an Active Directory forest named contoso.com.You install a new Exchange Server 2010 organization that contains a Client Access server named CAS1.You need to configure certificates in the organization to support the following client connections： 
（1）Autodiscover 
（2）Outlook Anywhere 
（3）Exchange ActiveSync 
What should you do？（）