单项选择题 You are the network administrator for your company. All network servers run Windows Server 2003 Service Pack 2 （SP2）. You deploy a DNS server named DNS1 that runs Windows Server 2003 SP2.  You need to configure DNS1 to use your ISP’s DNS servers to resolve all Internet queries. Internet name resolution should fail if the ISP’s DNS servers are unavailable.  What should you configure on DNS1 server？（）

单项选择题 Your network consists of a single Active Directory domain named contoso.com. All servers run Windows Server 2003 Service Pack 2 （SP2）. You deploy a Web server named Server1. Users access the server by using the URL http：//server1.contoso.com.  You need to create a new resource record that will allow users to access the server by using the URLhttp：//www.contoso.com. The solution must prevent the need to modify the new record if the IP address of Server1 changes. Which type of resource record should you configure？（）

单项选择题 Your network consists of a single Active Directory domain named contoso.com. All servers run Windows Server 2003 Service Pack 2 （SP2）. You plan to deploy a new DNS zone named adatum.com. You need to ensure that only computers in the contoso.com domain can update host records in the new DNS zone. What should you do？（）