[单选]
Your network contains an Active Directory domain named contoso.com. The domain contains the servers shown in the following table.
Server name Operating system Role
DC1 Windows Server 2008 Domain controller
DC2 Windows Server 2008 R2 Domain controller
DNS1 Windows Server 2008 DNS server DNS2 Windows Server 2008 R2 DNS server
The functional level of the forest is Windows Server 2003. The functional level of the domain is Windows Server 2003.
DNS1 and DNS2 host the contoso.com zone.
All client computers run Windows 7 Enterprise.
You need to ensure that all of the names in the contoso.com zone are secured by using DNSSEC.
What should you do first（）

A . Change the functional level of the forest.
B . Change the functional level of the domain.
C . Upgrade DC1 to Windows Server 2008 R2.
D . Upgrade DNS1 to Windows Server 2008 R2.

关于标准及方法选用以下描述正确的是（）国家标准与行业标准均现行有效，行业标准未引用国家标准时，优先选用行业标准。行业标准引用国家标准，国家标准已修订，行业标准未修订时，优先选用国家标准。根据判定依据选择试验方法。优先选用最新发布的标准。动物行为从一起车祸现场提取的检材中，属于法医学物证的为：（）地面上的血痕。人体上沾的油漆。车轮上沾的毛发。车体上沾的皮、肉。人衣服上沾的油泥。 Drag and drop question. The upper gives the MPLS functions， the bottom describes the planes. Drag the above items to the proper location at the below 关于生物酶工程的作用叙述不正确的是（）改变酶的别构调节能力。提高酶的最适温度。改变酶对辅酶的要求。改变酶的催化功能。提高酶的活性。

Your network contains an Active Directory domain named contoso.com. The domain contains the servers shown in the following table.
Server name Operating system Role
DC1 Windows Server 2008 Domain controller
DC2 Windows Server 2008 R2 Domain controller
DNS1 Windows Server 2008 DNS server DNS2 Windows Server 2008 R2 DNS server
The functional level of the forest is Windows Server 2003. The functional level of the domain is Windows Server 2003.
DNS1 and DNS2 host the contoso.com zone.
All client computers run Windows 7 Enterprise.
You need to ensure that all of the names in the contoso.com zone are secured by using DNSSEC.
What should you do first（）

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