单项选择题 You are designing the placement of the global catalog servers. You want to use the minimum number of global catalog servers that are required.  Which design should you use？（）

单项选择题 You are designing a strategy to upgrade the DHCP servers after the new Active Directory structure is in place.  Who can authorize the DHCP servers？（）

多项选择题 You are designing a DNS implementation strategy for the network.   Which two zone types should you use？（）