【单选题】
以下哪个不属于网络安全的四个特征之一。___
A. 保密性
B. 延时性
C. 完整性
D. 可用性
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答案
B
解析
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相关试题
【单选题】
网络安全的主要威胁因素有哪些___
A. 非人为的，自然力造成的数据丢失，设备失效，线路阻断
B. 人为的，但属于操作人员无意的失误造成的数据丢失
C. 来自外部和内部人员的恶意攻击和入侵
D. 以上都是
【单选题】
网络安全事故在很大程度上都是由于管理的失误造成的，所以要提高网络的安全性，就要做到安全管理，安全管理包括___
A. 严格的部门与人员的组织管理
B. 安全设备的管理
C. 安全设备的访问控制措施
D. 以上都是
【单选题】
网络安全的主要威胁因素不包括。___
A. 非人为的、自然力造成的数据丢失、设备失效、线路阻断
B. 设备老化带来的损失
C. 来自外部和内部人员的恶意攻击和入侵
D. 人为的，但属于操作人员无意的失误造成的数据丢失
【单选题】
获取口令的方法有四种，其中危害最大的是___
A. 获得用户口令文件后，破译口令文件
B. 通过网络监听非法得到用户令
C. 在知道用户的账号后利用一些专业软件猜测用户口令
D. 利用操作系统提供的默认账号和密码
【单选题】
在创建和确定安全策略时，涉及的人员类型包括___
A. 站点安全管理员、公司的大型用户管理员
B. 信息技术人员、安全事件响应小组
C. 法律顾问、相关责任部门
D. 以上都是
【单选题】
___属于DoS攻击。
A. 为Wi-Fi设置安全连接口令，拒绝用户访问网络
B. 发送大量非法请求使得服务器拒绝正常用户的访问
C. 设置访问列表从而拒绝指定用户访问
D. 为用户设定相应的访问权限
【单选题】
以下关于Smurf攻击的描述，哪句话是错误的___
A. 攻击者最终的目标是在目标计算机上获得一个帐号
B. 它依靠大量有安全漏洞的网络作为放大器
C. 它使用ICMP的包进行攻击
D. 它是一种拒绝服务形式的攻击
【单选题】
下到关于DoS攻击的描述中，哪句话是错误的？___
A. DoS攻击通常通过抑制所有或流向某一特定目的端的消息，从而使系统某一实体不能执行其正常功能，产生服务拒绝
B. DoS攻击不需入目标系统，仅从外部就可实现攻击
C. 只要软件系统内部没有漏洞，DoS攻击就不可能成功
D. Ping of Death、Land攻击、UDP洪水、Smurf攻击均是常见的DoS攻击手段
【单选题】
以下对拒绝服务攻击的分类叙述正确的是___
A. 按漏洞利用方式分类，可分为特定资源消耗类和暴力攻击类
B. 按攻击数据包发送速率变化方式分类，可分为固定速率和可变速率
C. 按攻击可能产生的影响，可分为系统或程序奔溃类和服务降级类
D. 以上都对
【单选题】
在侦测到网络中可能有DNS欺骗攻击后，防范措施不包括。___
A. 在客户端直接使用IP Address访问重要的站点
B. 对SMTP的数据进行加密
C. 对DNS Server的数据流进行加密
D. 对Client的数据流进行加密
【单选题】
关于IP协议与IP欺骗，下列不正确的是___
A. 基于TCP/IP，我们极难在IP数据包上对目标主机进行欺骗
B. IP欺骗不仅仅是伪造IP，还涉及如何去掌握整个会话过程
C. 对于IP协议来讲，源设备与目的设备是相互独立的
D. IP协议不会考虑报文在传输过程中是否丢失或出现差错
【单选题】
关于会话劫持下列不正确的是？___
A. 会话劫持是一种结合了嗅探和欺骗技术的攻击手段
B. 会话劫持有主动型的
C. 在会话劫持中，被冒充者不扮演如何角色
D. 会话劫持有被动型的
【单选题】
不小心遭受ARP欺骗攻击，下列应对措施无效的是。___
A. MAC地址绑定
B. 使用动态ARP缓存
C. 使用ARP服务器
D. 及时发现正在进行ARP欺骗的主机，并将它隔离
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Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
A. A
B. B
C. C
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—May I listen to the music here, Mr. White?
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A. A
B. B
C. C
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【单选题】
5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
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C. C
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【单选题】
6. A friend of my ____ and I are going to visit_______ next week．
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
A. A
B. B
C. C
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【单选题】
7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
A. A
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C. C
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【单选题】
8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
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9.—Well do what we can ____English well this term．
—It’s high time for you to work hard．
A. study B．to study C. be studied D. be studying
A. A
B. B
C. C
D. D
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
A. A
B. B
C. C
D. D
【单选题】
11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
A. A
B. B
C. C
D. D
【单选题】
12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
A. A
B. B
C. C
D. D
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
A. A
B. B
C. C
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【单选题】
14. We will have a _________ holiday after the exam．
A. two-month B. two month’s C. two month D. two-months
A. A
B. B
C. C
D. D
【单选题】
15. —We will build an underground in Xuzhou before 2015．
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
A. A
B. B
C. C
D. D
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16. — Emily, here’s a dictionary．I hope it will help you in some way．
— Thank you．It’s ________ what I need．
A. almost B. still C. only D. just
A. A
B. B
C. C
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【单选题】
17. —Oh．I’m hungry．Mum, can I have the hamburger on the plate?
—No．It tastes ．
A. terribly B. terrible C. good D. well
A. A
B. B
C. C
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【单选题】
18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
A. A
B. B
C. C
D. D
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years．
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
A. A
B. B
C. C
D. D
【单选题】
20.—I’m going back to see my grandparents this weekend．
—________．
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
A. A
B. B
C. C
D. D
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
A. A
B. B
C. C
D. D
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
A. A
B. B
C. C
D. D
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
A. A
B. B
C. C
D. D
【单选题】
24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
A. A
B. B
C. C
D. D
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
A. A
B. B
C. C
D. D
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A．England． B．France． C．America． D．China．
A. A
B. B
C. C
D. D
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A．He cares more about a flower and a sheep．
B．He meets many more strange adults on other planets．
C．He realizes his love for the rose and he goes back to his planet．
D．He discovers interesting things such as a snake, other roses and a fox
A. A
B. B
C. C
D. D
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
A．the adult world B．the planet B -612
C．a rose and a fox D．the adventure of a young prince
A. A
B. B
C. C
D. D
【单选题】
( ) 29. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
B．To tell people what kind of person his father was．
C．To tell the readers what present he got from his father．
D． To let people know how poor he was．
A. A
B. B
C. C
D. D
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
B．Because he was born from a poor family．
C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
A. A
B. B
C. C
D. D
【单选题】
( ) 31. What would someone learn from this passage？
A．How to live by oneself． B．How to stand on one's own feet．
C．What a good father should do． D．What the self-important is like．
A. A
B. B
C. C
D. D
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
A. A
B. B
C. C
D. D
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
A. A
B. B
C. C
D. D
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
A. A
B. B
C. C
D. D
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
A. A
B. B
C. C
D. S
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
A. A
B. B
C. C
D. D
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
A. A
B. B
C. C
D. D
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
A. A
B. B
C. C
D. D
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
A. A
B. B
C. C
D. D
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
A. A
B. B
C. C
D. D
