更多"The Internet is an open system,and "的相关试题:
[单项选择]The Internet is an open system．and most information is available to everyone．It is very important to add______to existing system for protecting the secret information.
A. Web pages
B. modem
C. security
D. network
[单项选择]The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing system for protecting the secret information.
A. web pages
B. modem
C. security
D. network
[单项选择]The most effective way to influence the information children retain from watching TV is ______.
A. criticizing bad programs
B. recommending good programs
C. choosing programs for children
D. proper intervention
[单项选择]So far, the solar system most like ours that have been discovered is ______.
A. in the group of stars known as Great Bear
B. 2.5 times as big as Jupiter
C. smaller that our system
D. impossible for us to reach at present time
[单项选择]The most pressing problem any economic system faces is how to use its scarce resources.
A. puzzling
B. controversial
C. terrifying
D. urgent
[单项选择]The most crucial problem any economic system faces is how to use its scarce resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
[单项选择]Most of the host operating system provides a way for a system administrator to manually configure the IP information needed by a host．Automated configuration methods, such as （）, are required to solve the problem．
A. IPsec
B. DHCP
C. PPTP
D. SOAP
[单项选择]The most (crucial) problem any economic system faces is how to use its scarce resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
[单项选择]According to the passage, the prices of information products and services will ______.
A. be a disaster for the users
B. go up in the developing countries
C. not stop decreasing in quite a long time.
D. drop sharply in future
[单项选择]（）are those programs that help find the information you are trying to locate on the WWW.
A. Windows
B. Search Engines
C. Web Sites
D. Web Pages
[单项选择]In most countries, the metric system has been ______ for all measurement.
A. admitted
B. adapted
C. applied
D. adopted
[单项选择]My interest in surfing on Internet has ______ most of my spare time, but it has repaid me a great deal of enjoyment.
A. taken off
B. taken down
C. taken up
D. taken away
[单项选择]OSI(Open System Interconnection)安全体系方案X.800将安全服务定义为通信开放系统协议层提供的服务，用来保证系统或数据传输有足够的安全性。X.800定义了五类可选的安全服务。下列相关的选项中不属于这五类安全服务的是 (19) 。
A. 数据传输
B. 访问控制
C. 认证
D. 数据保密性
[单项选择]OSI (Open System Interconnection)安全体系方案X.800将安全性攻击分为两类，即被动攻击和主动攻击。主动攻击包括篡改数据流或伪造数据流，这种攻击试图改变系统资源或影响系统运行。下列攻击方式中不属于主动攻击的为（）。
A. 伪装
B. 消息泄露
C. 重放
D. 拒绝服务
