《实用电子商务英语》unit5课件.pptx

1、PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：实用电子商务英语Unit 5 Computing System Security MeasuresPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Learning ObjectsAfter learning this unit,you will be able to:Know

2、 computing system security measures.Know what is the key facility that maintains the network security.Master words and expressions related to computing system security measures.PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：CONTENTSCONTENTS目 录Lead-inRead

3、ingTranslation Skills（否定转移）Business Writing（订购信）PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：CONTENTSCONTENTS目 录Grammar Review（状语从句）Supplementary Reading （网络安全）E-commerce-Related Knowledge （常用的信息安全技术）PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程

4、：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Part Lead-inPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Lead-inThink about the following questions and then discuss with your partners.Today,the Internet is one of the most powerful tools throughout the world.H

5、owever,at the same time the Internet provides services for us,it is inevitably invading our privacy to some to protect ourselves when we are surfing the Internet?What are your suggestions for raising peoples awareness of online safety?PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料

6、下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Part ReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Now with the computer network and e-commerce used widely,network security has become an important problem that we must consider and resolve.More and more professions1,

7、enterprises and individuals suffer from the security problem in different degrees.They are looking for the more reliable2 safety solution.In the defense3 system adopted by network security at present,the firewalls4 stand the very important position.As the key facility that maintains5 the network sec

8、urity,firewalls take the purpose of establishing an obstacle6 between trust and trustless network,and put corresponding safety strategy into practice.All the firewalls have the function to filter7 the IP address.The application firewall is a very efficient means of network security on Internet,it is

9、 installed8 between the trust and trustless network,can isolate9 the connection between the trust and trustless network,and doesnt hamper10 peoples access11 to the trust network at the same time.It can isolate the connection between the risk areaReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT

10、下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：(namely there may be a certain risk on Internet)and the safe area(LAN),and doesnt hamper peoples access to the safe area at the same time.Firewall can monitor the traffic12 flowing in and out from the network to finish the task seemingly13 impossible;it

11、only allows the safe and checked information to enter into,and meanwhile resists14 on the data that may bring about the threat to enterprise.An integrated15 firewalls system usually consists of screening router and proxy server.The screening router is a multi-port16 IP router,it check the each comin

12、g IP packet according to the group regular to judge whether to transmit17 it.The screening router gets information from the packet.For example the protocol number,the IP address and port number receiving and sending massages.The proxy server is server process in the firewall.It can replace the netwo

13、rk user to finish the specific TCP/IP function.Users contact with proxy server by one of the TCP/IP application such as Telnet or FTP.The proxy serverReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ask the users for the name of the remote host,whic

14、h users want to access.After the users have answered and offered the correct users identities18 and authentication information,the proxy server communicates the remote host,act as the relay between two communication sites.The whole course can be totally transparent19 to users.There are mainly three

15、types in the firewalls:packet filtering,application gateways and state detection.According to the present firewalls market,the domestic and international manufacturers of firewall can all support the basic function of the firewall well,including access control,the network address transform,proxy,aut

16、hentication,daily records audit20 etc.However,as stated before,with the attack to the network increasing,and users requisition21 for network security improving day by day,the firewall must get further development.Combine the present experience of research and development and the achievement,some rel

17、evant studies point out,ReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：according to the development trend of application and technology,how to strengthen the security of firewall,improve the performance of firewall,enrich22 the function of firewal

18、l,will become the problem that the manufacturer of firewalls must face and solve next.The purpose of the new generation firewall is mainly combining the packet filtering and proxy technology,overcoming the defects23 in the safety respect of two;being able to exert24 the omnidirectional25 control fro

19、m the layer of data chain to the application layer;implementing26 the micro-kernel of TCP/IP protocol to perform all the security control on the layer of TCP/IP protocol;based on the micro-kernel above,making the speed to exceed the traditional packet filtering firewall;offering the transparent mode

20、 of proxy27;lightening the configuration28 work on the client;supporting the data encryption and decryption(DES and RSA);offering the strong support to the Virtual Private Network(VPN);hiding the Inside information totally;producing a new firewallReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PP

21、T下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：theory.The new technique of firewalls has not only covered all the functions of traditional packet filtering firewalls,but also has remarkable29 advantages in opposing overall the attack means of IP deception30,SYN Flood,ICMP,ARP,etc.strengthening proxy

22、 service,merging31 it with packet filtering,then adding the intelligence filtering technology to make the security of the firewall rising to another height.Now the firewall has already been widely used on Internet,and because of its characteristic of not limited to the TCP/IP protocol,it has more vi

23、tality32 outside Internet progressively33 too.To be subjective34,the firewall is not the omnipotent35 prescription36 of solving the problem of network security,but only a component of the network security policy and tactics37.However,understanding the technology of firewall and learning to use it in

24、 actual operation,believing that every net friend may be benefited a lot from the network life in the new century.ReadingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingVocabulary1 profession/prfen/n.行业，职业2 reliable/rlabl/adj.可靠的；可信赖的3 defense/dfen

25、s/n.防御；保护；保卫4 firewall/fawl/n.防火墙（防止窃取信息的系统）5 maintain/menten/v.维持；继续；维修；主张；供养6 obstacle/bstkl/n.障碍；阻碍7 filter/flt(r)/v.（用程序）筛选，过滤8 install/nstl/v.安装，建立（程序）9 isolate/aslet/v.（使）隔离，孤立，脱离10 hamper/hmp(r)/v.妨碍；阻止；阻碍11 access/kses/n.通道；通路；入径12 traffic/trfk/n.信息流量；通信（量）13 seemingly/simli/adv.看似；貌似；表面上PPT

26、模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingVocabulary14 resist/rzst/v.抵制；阻挡15 integrated/ntgretd/adj.各部分密切协调的；综合的16 multi-port/mlti pt/adj.多端口的17 transmit/trnsmt/v.传送；输送；发射；播送18 identity/adentti/n.身份；本身；本体19 transparent/trnsprnt/adj.易懂的；显而易见的20 a

27、udit/dt/n.（质量或标准的）审查，检查21 requisition/rekwzn/n.征用令；授权书22 enrich/nrt/v.充实；使丰富23 defect/difekt/n.缺点；缺陷；毛病24 exert/gzt/v.运用，发挥；施以影响25 omnidirectional/mndreknl/adj.（接收或发射信号）全向的26 implement/mplment/v.实施，执行；实现，使生效PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：

28、ReadingVocabulary27 proxy/prksi/n.代理权；代表权28 configuration/knfgren/n.（计算机的）配置29 remarkable/rmkbl/adj.非凡的；奇异的；显著的30 deception/dsepn/n.诡计；骗术；骗局31 merge/md/v.（使）合并，结合，并入32 vitality/vatlti/n.生命力；活力；热情33 progressively/prgresvli/adv.持续稳定地；逐步地；愈益34 subjective/sbdektv/adj.主观的（非客观的）35 omnipotent/mnptnt/adj.全能

29、的，权力无限的36 prescription/prskrpn/n.对策；解决方案37 tactic/tktk/n.策略；手段；招数PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingTechnical Words and Abbreviations1 application firewall 应用防火墙2 LAN:local area network 局域网3 screening router 屏蔽路由器4 proxy server 代理服务器5

30、TCP:Transmission Control Protocol 传输控制协议6 Telnet 远程登录7 FTP:File Transfer Protocol 控制协议8 packet filtering 信息包过滤9 application gateway 应用网关10 state detection 状态检测PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingTechnical Words and Abbreviations11 VPN:V

31、irtual Private Network虚拟专用网12 SYN Flood泛洪攻击，是一种广为人知的 DoS（拒绝服务攻击），是DDoS （分布式拒绝服务攻击）的方式之 一，这是一种利用TCP协议缺陷，发送大量伪造的TCP连接请求，从而使得被攻击方资源耗尽 （CPU满负荷或内存不足）的攻击 方式13 ICMP:Internet Control Message Protocol 网际控制报文协议14 ARP:Address Resolution Protocol地址解析协议PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：

32、教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingNotes to the PassageMore and more professions,enterprises and individuals suffer from the security problem in different degrees.【译文】越来越多的行业、企业和个人受到不同程度的安全问题的困扰。suffer from 遭受 e.g.The little children suffered from high fever.in different degrees 不同程度地The applic

33、ation firewall is a very efficient means of network security on Internet,it is installed between the trust and trustless network,can isolate the connection between the trust and trustless network,and doesnt hamper peoples access to the trust network at the same time.【译文】应用防火墙是互联网上一种非常有效的网络安全手段，它安装在信

34、任网络和无信任网络之间，能够隔离信任网络和无信任网络之间的连接，同时不妨碍人们访问信任网络。hamper peoples access to 阻碍人们进入PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingNotes to the PassageAn integrated firewalls system usually consists of screening router and proxy server.【译文】一个完整的防火墙系统通常由屏

35、蔽路由器和代理服务器组成。【句子解析】integrated为过去分词作定语，修饰firewalls。consist of 由组成According to the present firewalls market,the domestic and international manufacturers of firewall can all support the basic function of the firewall well,including access control,the network address transform,proxy,authentication,daily

36、 records audit etc.【译文】根据目前的防火墙市场，国内外的防火墙厂商都能很好地支持防火墙的基本功能，包括访问控制、网络地址转换、代理、认证、日常记录审计等。including和included的区别如下：（1）There are many things on the desk,including a pen,a book,an apple and two rings.（2）There are many things on the desk,a pen,a book,an apple and two rings included.PPT模板下载：行业PPT模板：节日PPT模板：

37、素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises1.Why network security becomes more and more important?_2.Whats the function of firewalls?_3.How many types are there in the firewalls?What are they?_4.Whats the purpose of the new generation firewall?_ Answer the f

38、ollowing questions according to the passage.Because the computer network and e-commerce are used widely.All the firewalls have the function to filter the IP address.There are mainly three types in the firewalls:packet filtering,application gateways and state detection.The purpose of the new generati

39、on firewall is mainly combining the packet filtering and proxy technology.PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises Translate the following words and phrases into Cwork security_2.suffer from_3.in different degrees_4.to be subjectiv

40、e_5.traffic flowing_6.resist on_7.TPC_8.omnipotent prescription_9.consist of_10.point out_网络安全遭受在不同程度上主观上信息流抵抗传输控制协议全能的对策由组成指出PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises Translate the following phrases into English.1防御系统_2局域网_3远程登录_4应

41、用网关_5应用防火墙_6代理服务器_7洪泛攻击_8数据链_9阻止人们进入_10状态检测_defense systemlocal area network telnetapplication gateway application firewall proxy serverSYN flood data chain hamper peoples access tostate detectionPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExer

42、cises Fill in the blanks with the words given below.Change the form if necessary.defensefilter install hamper progressivelyseeminglyproxy exert implement omnipotent1.The situation was becoming _ more difficult.2.A _ endless line of trucks waits in vain to load up.3.Leadership is about the ability to

43、 _ change.4.All drinking water must be _.5.He _ all his authority to make them accept the plan.progressivelyseemingimplementfilteredexertPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises Fill in the blanks with the words given below.Change

44、the form if necessary.defensefilter install hamper progressivelyseeminglyproxy exert implement omnipotent6.The immune system is our main _ against disease.7.Money is not _,but we cant survive without money.8.The bad weather _ rescue operations.9.You can vote either in person or by _.10.Ill need some

45、 help _ the software.defenseomnipotenthamperedproxyinstallingPPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises1.More and more professions,enterprises and individuals surfer from the security problem in different degrees._2.As the key facili

46、ty that maintains the network security,firewalls take the purpose of establishing an obstacle between trust and trustless network,and put corresponding safety strategy into practice._ Translate the following sentences into Chinese.越来越多的职业、企业和个人在不同程度上受到安全问题的困扰。作为维护网络安全的关键设施，防火墙以建立信任和无信任网络之间的障碍为目的，并将相

47、应的安全策略付诸实践。PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：ReadingExercises3.All the firewalls have the function to filter the IP address._4.The proxy server is server process in the firewall._5.To be subjective,the firewall is not the omnipotent prescrip

48、tion of solving the problem of network security,but only a component of the network security policy and tactics._ Translate the following sentences into Chinese.所有的防火墙都有过滤IP地址的功能。代理服务器是防火墙中的服务器进程。主观上讲，防火墙不是解决网络安全问题的万能办法，只是网络安全政策和策略的组成部分。PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：

49、资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Part Translation Skills （否定转移）PPT模板下载：行业PPT模板：节日PPT模板：素材下载：PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Translation Skills（否定转移）否定转移是指否定形式在谓语动词，而否定的信息焦点却在状语和表语，或否定形式在主句，而否定的信息焦点却在从句。这是英语的一种习惯思维方法，与汉语不同，因此在英译汉时应注意将“否定”转移回来。PPT模板下载：行业PPT模板：节日PPT模板：素材下载：

50、PPT背景图片：图表下载：优秀PPT下载：教程：Word教程：教程：资料下载：课件下载：范文下载：试卷下载：教案下载：字体下载：Translation Skills（否定转移）n由think,believe,suppose,expect,imagine,fancy,reckon等引导的从句，在汉译英时应使用否定转移。【例】We dont believe that our mother tongue is inferior to any other language in the world.我们相信，祖国的语言并不亚于世界上任何其他语言。n有些动词，如assume,surmise和presum