1、 Unit 1 Computer Hardware Unit 2 Computer Software Unit 3 Computer Network Unit 4 MultimediaCONTENTS Unit 5 E-commerce Unit 6 Computer Security Unit 7 Big Data Unit 8 Cloud Computing Unit 3 Computer NetworkSpeakingListeningReadingWritingInternet Protocol Suite网络协议组网络协议组 Physical物理层 Link 链接层 Network网
2、络层TransportApplication 应用层传输层1 Look at the following graphic and speak out each part of Internet protocol suite.1 Look at the following graphic and speak out each part of Internet protocol suite.Input device 输入装置输入装置 Main bus主总线 Node/PC节点 Connection wire连接线TransportApplication 应用层传输层2.List the Chine
3、se names of the marks in the following network topologies.2.List the Chinese names of the marks in the following network topologies.3.Suppose you are a network administrator.Give a presentation to each picture in English.3.Suppose you are a network administrator.Give a presentation to each picture i
4、n English.Picture 1 Introduce the common network devices to your customers.Picture 1 Introduce the common network devices to your customers.Picture 2 Tell your friends what do you usually do in your daily work.Picture 2 Tell your friends what do you usually do in your daily work.3.Suppose you are a
5、network administrator.Give a presentation to each picture in English.3.Suppose you are a network administrator.Give a presentation to each picture in English.1.Listen carefully and choose the words you hear.1.Listen carefully and choose the words you hear.1.A.cloudB.roundC.loudD.ground2.A.pastB.pass
6、C.fast D.last3.A.fatherB.furtherC.leatherD.weather4.A.shopB.shotC.shootD.soft5.A.whiteB.rightC.red D.light6.A.bookB.bootC.footD.fork7.A.shoes B.whoseC.noseD.mouse8.A.messageB.massage C.methods D.markets9.A.showB.snowC.wholeD.shoe10.A.sinkB.thinkC.sick D.thickKeys:1.A.2.B.3.D.4.C.5.B.6.D.7.B.8.C.9.C.
7、10.A.2.Listen to the short passage and choose the proper words to fill in 2.Listen to the short passage and choose the proper words to fill in the blanks.the blanks.GSM(Global System for Mobile communications is the most popular 1 (qualification,standard,popularity)for mobile phones in the world.Its
8、 promoter,the GMS Association,estimates that 2 (85%,90%,80%)of the global mobile market uses the standard.GSM is used by over 3 3 (billion,million)people across more than 212 countries and territories.Its ubiquity makes international roaming very common between mobile phones operators,enabling subsc
9、ribers to use their phones in many parts of the world.GSM differs from its predecessors in that both signaling and speech channels are 4 (digital,digitized,dignified),and thus is considered a second generation(2G)mobile phone system.This has also meant that 5 (data,digital,stimulus)communication was
10、 easy to build into the system3.Listen to the dialogue and choose the best responses to what you hear.3.Listen to the dialogue and choose the best responses to what you hear.1.A.Im flying back tomorrow.B.See you next time.C.Its my pleasure.D.Its Tuesday._2.A.Speaking B.Id like to put up a telephone
11、service,please.C.Is there Susan speaking?D.You must have the wrong number._3.A.Its delicious.B.Its lucky.C.Its sure.D.Its fine._ 4.A.Yes,I think so.B.Do you really think so?C.No,its not very beautiful.D.Oh,thank you._A AB BD DD D3.Listen to the dialogue and choose the best responses to what you hear
12、.3.Listen to the dialogue and choose the best responses to what you hear.5.A.Maybe.B.The same to you.C.Where are you going?D.OK.Ill visit my parents._ 6.A.Sorry,Im a stranger here.B.Well,Ill never know what you say.C.Sorry,I wont give you the way.D.Well,Ill tell you next time._7.A.Nice to see you.B.
13、How about you?C.Not too bad.D.How do you feel it?_8.A.You are so polite.B.We are so close friends.C.Dont say so.D.You are so welcome._B BA AC CD D4.Listen to the dialogues and choose the best answer to each question 4.Listen to the dialogues and choose the best answer to each question you hear.you h
14、ear.1.A.strictB.friendly C.kind D.patient2.A.a terrible traffic accident B.a rush hour C.a terrible air crash D.an airport3.A.the pronunciation of the word B.the spelling of the word C.the meaning of the wordD the explanation of the word4.A.some coffeeB.some juice.C.some cakes D.some oranges5.A.Trav
15、elingB.Reading stories C.Writing storiesD.writing magazines5.Listen to the dialogue and answer the following questions by filling 5.Listen to the dialogue and answer the following questions by filling in the blanks.in the blanks.1.Who is Alice White?She is a _.2.How old is she now?She is _.3.When di
16、d she become famous?She became famous _.4.Why has she given up swimming?Because _.5.What time did she get up to go to the pool when she was young?She get up _.swimming player20 at the age of 15She is tired of it the 6 a.m.6.Listen to the passage and fill in the blanks with words you hear.Some new wo
17、rds 6.Listen to the passage and fill in the blanks with words you hear.Some new words given below will be of some help to you.given below will be of some help to you.How Babies CommunicateHow Babies Communicate Babies are born with the 1 to cry,which is how they 2 for a while.Your babys cries genera
18、lly tell you that something is 3 :an empty belly,a wet bottom,cold feet,being tired,or a need to be held and cuddled,etc.Soon youll be able to 4 which need your baby is expressing and respond accordingly.In fact,sometimes what a baby needs can be identified by the type of cry for example,the“Im hung
19、ry”cry may be short and low-pitched,while“Im upset”may 5 choppy.Your baby may also cry when overwhelmed by all of the 6 and 7 of the world,or for no apparent reason at all.Dont be too 8 when your baby cries and you arent able to console him or her 9 :crying is one way babies shout out stimuli when t
20、heyre 10 .Keys:1.ability municate 3.wrong 4.recognize 5.sound 6.sights 7.sounds 8.upset 9.immediately 10.overloaded Passage A Computer networkComputer network A computer network or data network is a digital telecommunications network which allows nodes to share resources.In computer networks,network
21、ed computing devices exchange data with each other using a data link.The connections between nodes are established using either cable media or wireless media.Passage A Network nodes A computer or other device connected to a network,which has a unique address and is capable of sending or receiving da
22、ta are called network nodes.Nodes can include hosts such as personal computers,phones,servers as well as networking hardware.Two such devices can be said to be networked together when one device is able to exchange information with the other device,whether or not they have a direct connection to eac
23、h other.Passage A Network Protocols In order to get traffic flowing,you need protocols ruling how data is sent,received and interpreted by the networked devices.The protocols are stacked in several layers and together they make up the Internet Protocol Suite.On the lowest layer(the link layer)there
24、is a protocol dealing with digital electronics.In a LAN or Local Area Network,this is the Ethernet Protocol.On top of this comes the Internet layer.Here we have the Internet Protocol(IP).From this point on a concept,referred to as IP addressing becomes available.Next in the Transport Layer,we find t
25、he Transmission Control Protocol or TCP for short,and User Datagram Protocol(UDP).Again,there may be other protocols in this layer.One more layer up is the Application Layer,which has protocols we know from everyday use,such as HTTP,SMTP and also P2P(peer to peer)voice communication.Passage A Comput
26、er networks support an enormous number of applications and services such as access to the World Wide Web,digital video,digital audio,shared use of application and storage servers,printers,and fax machines,and use of email and instant messaging applications as well as many others.Computer networks di
27、ffer in the transmission medium used to carry their signals,communications protocols to organize network traffic,the networks size,topology and organizational intent.The best-known computer network is the Internet.Passage A A computer network or data network is a digital telecommunications network w
28、hich allows _(1)to share _(2).In computer networks,networked computing devices exchange _(3)with each other using a _(4).The connections between nodes are established using either_(5)or _(6).1.Fill in the blanks without referring to the passage 1.Fill in the blanks without referring to the passageno
29、desresourcesdata _data link cable mediaWireless mediaPassage A(1).What is computer network?A computer network or data network is a digital telecommunications network which allows nodes to share resources.(2).How to define network nodes？List several examples.A computer or other device connected to a
30、network,which has a unique address and is capable of sending or receiving data are called network nodes.Nodes can include hosts such as personal computers,phones,servers as well as networking hardware.(3).Describe in your own words how the Internet Protocol Suite is organized.According to the passag
31、e,Internet Protocol Suite mainly includes link layer,Internet layer,Transport Layer,Application Layer.2.Answer the following questions according to the passage 2.Answer the following questions according to the passage Passage A(4).What is the top layer in the Internet Protocol Suite?Can you speak ou
32、t several protocols we usually use in the layer?It is the Application Layer,which has protocols we know from everyday use,such as HTTP,SMTP and also P2P(peer to peer)voice communication.(5).Which is the best-known computer network?2.Answer the following questions according to the passage.2.Answer th
33、e following questions according to the passage.The best-known computer network is the Internet.Passage A1.A computer network or data network is a digital telecommunications network which allows _ to share resources.2.In computer networks,networked computing devices exchange data with each other usin
34、g a _.3.A computer or other device connected to a network,which has a unique address and is capable of sending or receiving data are called _.4.In order to get traffic flowing,you need _ ruling how data is sent,received and interpreted by the networked devices.5.On the lowest layer(the link layer)th
35、ere is a protocol dealing with _.6.Computer networks differ in _ _ 3.Complete each of the following statements according to the passage 3.Complete each of the following statements according to the passage nodesdata linknetwork nodesprotocolsdigital electronicsthe transmission medium,communicationspr
36、otocols,the network size,topology organizational internet.Passage A(1)因特网是一个全球计算机网络系统。(network)The Internet is a worldwide computer network.(2)我们认为她完全能够照顾自己。（be capable of）We think that she is absolutely capable of taking care of herself.(3)钱是用来买卖的一种媒介。（medium）Money is a medium for buying and sellin
37、g.(4)他的吉他弹得和你一样好。（as well as）He plays the guitar as well as you.4.Translate the following sentences into English.4.Translate the following sentences into English.Passage A(5)女警察构成警力的13%。(make up)Women officers make up 13 percent of the police force.(6)唯一一点是不能用无线设备。(wireless)He only thing is no wirel
38、ess devices.(7)到镇上唯一的通路是经过那座桥。(access to)The only access to the town is across the bridge.(8).人们对失败持有不同的态度。（differ in)4.Translate the following sentences into English.4.Translate the following sentences into English.People differ in their attitudes towards failure.Passage A(1)A computer network or d
39、ata network is a digital telecommunications network which allows nodes to share resources.计算机网络或数据网络是一个允许节点共享资源的数字通信网络。(2)In computer networks,networked computing devices exchange data with each other using a data link.在计算机网络中，联网的计算设备利用数据传输器互相交换数据。5.Translate the following sentences into Chinese.5.T
40、ranslate the following sentences into Chinese.Passage A(3)A computer or other device connected to a network,which has a unique address and is capable of sending or receiving data are called network nodes.网络节点指与网络连接的电脑或其它设备，它们拥有独立地址，并能够发送和接受数据。(4)Two such devices can be said to be networked together
41、when one device is able to exchange information with the other device,whether or not they have a direct connection to each other.不管是否是直接连接，当其中一个设备能够与其它设备交换信息时，这两种设备就可看做联网了。5.Translate the following sentences into Chinese.5.Translate the following sentences into Chinese.Passage A(5)The protocols are
42、stacked in several layers and together they make up the Internet Protocol Suite.协议在几个层面堆积起来，形成互联网协议组。(6)Next in the Transport Layer,we find the Transmission Control Protocol or TCP for short,and User Datagram Protocol(UDP).在传输层，我们发现了传输控制协议，简称TCP，和用户数据报协议（UDP）。Task 5.Translate the following sentences
43、 into Chinese.Task 5.Translate the following sentences into Chinese.Passage A(7)One more layer up is the Application Layer,which has protocols we know from everyday use。再往上一层是应用层，这里有我们从日常使用中了解的协议。(8)Computer networks differ in the transmission and communication protocols.计算机网络在传输和通信协议方面会有所不同。5.Trans
44、late the following sentences into Chinese.5.Translate the following sentences into Chinese.Passage A(9)The best-known computer network is the Internet.最著名的计算机网络是因特网。(10)Computer networks support an enormous number of applications and services such as access to the World Wide Web.计算机网络支持大量的应用和服务，如万维网
45、。5.Translate the following sentences into Chinese.5.Translate the following sentences into Chinese.Passage BNetwork Topology Network Topology Network topology is the arrangement of the various elements of a communication network,including its nodes and connecting lines.There are two ways of defining
46、 network geometry:the physical topology and the logical(or signal)topology.The physical topology of a network is the actual geometric layout of workstations.There are several common physical topologies,as described below and as shown in the illustration.Passage B In the bus network topology,every wo
47、rkstation is connected to a main cable called the bus.Therefore,in effect,each workstation is directly connected to every other workstation in the network.In the star network topology,there is a central computer or server to which all the workstations are directly connected.Every workstation is indi
48、rectly connected to every other through the central computer.Passage B In the ring network topology,the workstations are connected in a closed loop configuration.Adjacent pairs of workstations are directly connected.Other pairs of workstations are indirectly connected,the data passing through one or
49、 more intermediate nodes.If a Token Ring protocol is used in a star or ring topology,the signal travels in only one direction,carried by a so-called token from node to node.Passage B The mesh network topology employs either of two schemes,called full mesh and partial mesh.In the full mesh topology,e
50、ach workstation is connected directly to each of the others.In the partial mesh topology,some workstations are connected to all the others,and some are connected only to those other nodes with which they exchange the most data.The tree network topology uses two or more star networks connected togeth
