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单选题
防火墙主要功能包括（）。
A
包过滤、审计和报警机制、管理界面、代理
B
包过滤、网络级过滤、应用级过滤
C
网络级过滤、审计、代理服务、监控
D
报警机制、用户身份认证、配置、监控
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考题
单选题To compete in today's fast-paced competitive environment, organizations are increasingly allowing contractors, partners, visitors and guests to access their internal enterprise networks.These users may connect to the network through wired ports in conference rooms or offices, or via wireless access points. In allowing this open access for third parties, LANs become(6) .Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to(7)activity. For many organizations, however,the operational complexity and costs to ensure safe third party network access have been prohibitive. Fifty-two percent of surveyed CISOs state that they currently use a moat and castle's security approach, and admit that defenses inside the perimeter are weak. Threats from internal users are also increasingly a cause for security concerns. Employees with malicious intent can launch (8) of service attacks or steal (9) information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with (10) and worms acquired from unprotected public networks. Hackers masquer-ading as internal users can take advantage of weak internal security to gain access to confidential information.
空白处（8）应选择（）A
denialB
virtuousC
completeD
traverse
考题
单选题通信协议中规定了对等实体之间信息传输的基本单位，它是由（3）所组成的，在协议中，关于"数据的组织方式"是属于（4）要素。空白处（4）应选择（）A
语法B
语义C
文法D
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