单项选择题 Your company’s organization is authoritative for the contoso.com domai.Your network contains a Windows Server 2008 R2 certification authority （CA）.You have an Exchange Server 2010 server named Server1.Server1 has the Client Access， Hub Transport， and Mailbox server roles installed. You plan to create a Federated Sharing relationship between your company and another company named Northwind Traders.Northwind Traders has an internal root CA.You need to install a certificate that can be used to create the federated trust.The solution must minimize costs. What should you do from Server1？（）

单项选择题 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？（）

单项选择题 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？（）