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问题 选择题

世界环保大会于2010年7月28日至30日在中国北京举行。资源回收与再生利用是环境保护工作的重要概念，下列哪个人的发明过程体现出了这一概念的特点[ ]

A．黄帝

B．扁鹊

C．张衡

D．蔡伦

答案

答案：D

单项选择题

采用广播信道通信子网的基本拓扑构型主要有：总线型、树型与( )。

A．层次型

B．网格型

C．环型

D．网型
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单项选择题

NAC’s (Network Access Control) role is to restrict network access to only compliant endpoints and（）users. However, NAC is not a complete LAN（）solution; additional proactive and（）security measures must be implemented. Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 10Gbps, ensuring a high level of security plus application availability and performance. Nevis integrates NAC as the first line of LAN security（）. In addition to NAC, enterprises need to implement role-based network access control as well as critical proactive security measures — real-time, multilevel（）inspection and microsecond threat containment.

NAC’s (Network Access Control) role is to restrict network access to only compliant endpoints and（）users.

A．automated

B．distinguished

C．authenticated

D．destructed
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