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什么是入侵检测,它是否可以作为一种安全策略单独使用?

答案

参考答案:

入侵检测是指对入侵行为的发觉。它通过在计算机网络或计算机系统中的若干关键点收集信息并对收集到的信息进行分析,从而判断网络或系统中是否有违反安全策略的行为和被攻击的迹象。入侵检测系统则是是完成入侵检测功能的软件、硬件及其组合它试图检测、识别和隔离“入侵”企图或计算机的不恰当未授权使用。入侵监测系统一般处于防火墙之后对网络活动进行实时检测。许多情况下,由于可以记录和禁止网络活动,所以入侵监测系统是防火墙的延续。它们可以和防火墙和路由器配合工作,一般不作为一种安全策略单独使用。

阅读理解

Time flies. Your time in junior high school will come to an end in a few months. Let’s look back over the last three years. What were the highs and lows?

For Zhang Xiaomeng, a senior high school girl from Jiangsu, meeting her best friend Hua Xuan was the best part of her time at junior high school. They went to class together, had lunch together, and even went to the washroom together. Having one or two best friends is important, said Xu Zheng, a teacher from Jiangsu. “Students have secrets. They don’t want to tell their parents,”Xu added. However, being too rebellious (叛逆的) in junior high is the biggest regret for Liu Anqing, a senior high school student from Fujian. “I didn’t listen to my parents. I quarreled with my mother every week,” said Liu. “I wish I could go back to that time and get on well with them.” Time also needs to be taken care of. Zhang Zihua, 15, from Shanxi, thought he had plenty of time to prepare for the big exam at the end of Junior 3. Then one day, he was told: “The exam is in 100 days.” “We need a strong knowledge base to pass the exam. But I didn’t care about it,” said Zhang. Gu Xiaoli, a teacher from Jiangsu, said that it’s never too late to catch up. “No matter your regrets about wasted time, you can always pick things up from now,” said Gu.

小题1:How many students shared their ideas in the passage?

A.Three.

B.Four.

C.Five.

D.Six.小题2:The underlined word “regret” in Paragraph 2 most probably means a feeling of __________.

A.happiness

B.surprise

C.anger

D.sadness小题3:Which of the following is true about Liu Anqing?

A.She quarreled with her parents every day when she was a little girl.

B.Her parents didn’t like her at all.

C.She didn’t do well in her study at junior high school.

D.She didn’t get on well with her parents when she was in junior high school.小题4:What’s wrong with Zhang Zihua?

A.He didn’t pass the exam.

B.He had no good friends.

C.He didn’t get ready for the exam.

D.He didn’t get on well with his parents and teachers.

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