单项选择题 Your network contains three Active Directory sites named Site1， Site2， and Site3. Users can only access Site1 from the Internet.  In each site， you plan to deploy a Mailbox server and a Hub Transport server.  You need to plan the deployment of Exchange servers to meet the following requirements： .Ensure that Exchange ActiveSync and Outlook Anywhere clients can connect to their Mailboxes from theInternet .Minimize hardware costs What should you include in your plan？（）

单项选择题 You have a Microsoft Internet Security and Accelerator （ISA） 2006 server that provides all Internet accessfor your company.  You have two Mailbox servers configured in a database availability group （DAG）， two Client Accessservers， and two Hub Transport servers.  You need to recommend changes to the environment to ensure that users can access Outlook Web App（OWA） from the Internet if any single server fails.  What should you recommend？（）

单项选择题 Your company has an Active Directory forest.  The network contains Exchange Server 2007 Service Pack 1 （SP1） and Exchange Server 2003 ServicePack 2 （SP2） servers.  All domain controllers run Windows Server 2003 （x86） Service Pack 1 （SP1）. You plan to deploy Exchange Server 2010 on the network.  You need to recommend changes to the servers so that you can deploy Exchange Server 2010 servers.  What should you upgrade first？（）