单项选择题 You have an Exchange Server 2010 organization.  The organization contains two servers named Server1 and Server2.  Server1 and Server2 have the Mailbox server role and the Hub Transport server role installed. Server 1 and Server2 are members of a database availability group （DAG）.  You need to plan the deployment of Client Access servers to meet the following requirements： .Users must be able to access their mailboxes if a single server fails .Users must not attempt to connect to a failed server  What should you include in your plan？（）

单项选择题 You deploy multiple Mailbox servers.  Each Mailbox server contains a copy of a mailbox database named DB1.  You need to recommend a solution that allows administrators to remove corrupt messages that have been replicated before the corrupt messages are applied to each copy of DB1. What should you recommend？（）

单项选择题 You have an Exchange Server 2010 organization.  The network contains two Mailbox servers that are configured in a database availability group （DAG）. You plan to implement a disaster recovery solution.  You need to recommend a solution that ensures that the active mailbox database copy is unaffected bythe backup process.  You want to achieve this goal while minimizing costs.  What should you recommend？（）