单项选择题 You run a Windows Server 2012 R2, what is the PowerShell command to set preferred dns server. Note: Other config such as ip address should not be changed.（）

多项选择题 Which of the following are the two built-in user accounts created automatically on a computer running Windows Server 2012 R2?（）

单项选择题 You work as an administrator at Contoso.com. The Contoso.com network consists of a single domain named Contoso.com. All servers on the Contoso.com network have Windows Server 2008 R2 installed. Most of the Contoso.com servers have 64 – bit CPU’s installed, while the rest have 32 – bit CPU’s installed. You are informed that Contoso.com wants to deploy Windows Server 2012 R2 on all their servers. You need to make recommendations to ensure that this is possible. Which of the following would you recommend?（）