电子信息专业英语(5)
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LAN 局域网 MAN 城域网 WAN 广域网
山东信息职业技术学院电子工程系
计算机网络的优点(网络的主要功能)
The benefit of network is that it can transmit information rapidly and easily among widely separated people; people can share hardware and software resources on the network; a computer network can also provide high reliability by having alternative source of supply.
communication 通信 located in … 位于,坐落于 exchange
交换, 互换, 交流
山东信息职业技术学院电子工程系
say
adv 比方说,例如
Similarly, at a local level within, say, a single building or establishment, distributed communities of computer-based workstations use local communication networks to access expensive shared resources--for example, printers, copiers, disks, tapes, etc.--that are also managed by computers.
山东信息职业技术学院电子工程系
Unit Twelve Computer Networks
What is the computer networks? What are the benefits of computer network?
山东信息职业技术学院电子工程系
山东信息职业技术学院电子工程系
New Words and Expressions community [ kə'mju:niti ] n.公社,团体,共有,一致 exchange [ iks'tʃeindʒ ] v.交换 access [ 'ækses] n. 存取,接近,访问 proliferate [ prəu'lifəreit ] v.增生扩散 dominate [ 'dɔmineit ] v.支配,占优势 terminal [ 'dɔmineit ] n.终端 initial [ i'niʃəl ] adj. 最初的,初始的 definite [ 'definit ] adj.明确的,一定的,有限的
national level, for example, computers located in different pats of the country use public communication services to exchange electronic messages (mail) and to transfer files of information from one computer to another.
山东信息职业技术学院电子工程系
protocol [ 'prəutəkɔl ] n. 协议 formulate [ 'fɔ:mjuleit ] v. 明确地表达,阐明 coordination [ kəuɔ:di'neiʃən ] n.协调,协同,一致 evolve [ i'vɔlv ] v.发展,进展,进化 perspective [ pə'spektiv ] n. 观点,看法,远景 reliable [ ri'laiəbl ] adj. 可靠的,可信赖的 geographically [ dʒiə'ɡræfikəli] adj. 地理上的 facility [ fə'siliti ] n. 设备,工具 alternative [ ɔ:l'tə:nətiv ] adj.可选择的,可替换的
Fig.12-1 The Model of OSI
Fig.12-1 The Model of OSI
山东信息职业技术学院电子工程系
A network is a series of points interconnected by communication lines, located at the points are computer, switching devices, and/or user terminals. A typical network includes the following components: host computers, nodes, terminal controllers, and terminals.
山东信息职业技术学院电子工程系
distributed systems Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer be termed
network architecture 网络构架(框架) key concept 主要(关键)概念 protocol 协议( 网络通信过程中对等层间的约定)
山东信息职业技术学院电子工程系
The ISO, in the late 1970s, formulated a reference model to provide a common basis for the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another. The ultimate aim was to allow an application process in any computer that supported the applicable standards to freely communicate with an application process in any other computer supporting the same standard, irrespective of its origin of manufacture. This model was termed the ISO Reference Model for Open System Interconnection (as shown in Fig.12-1). It should be stressed, however, that this model is not concerned with specific applications of computer communication networks. Rather, it is concerned with the structuring of the communication software that is needed to provide a reliable, data transparent with the structuring of the communication software that is needed to provide a reliable, data transparent communication service (which is independent of any specific manufacturers equipment or conventions) to support a wide range of applications.
山东信息职业技术学院电子工程系
Clearly, as the range of computer communication networks proliferate, computer to computer communication will expand rapidly and ultimately dominate the field of distributed systems. A communication network is a series of points interconnected by communication lines, located at the points are computers, switching devices, and user terminals.
山东信息职业技术学院电子工程系
ISO Reference Model for Open System Interconnection ( OSI/RM)
Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer
可选择的可替换的山东信息职业技术学院电子工程系distributedsystems分布式系统applicationlayer应用层sentationlayer表示层sessionlayer会话层transportationlayer传输层networklayer网络层datalinklayer数据链路层physicallayer物理层betermed把
典型的计算机网络包括: 主机,节点,终端控制器和终端 terminal adj. 1. 末端的, 终点的, 极限的2. 末期的, 晚期的 n. 1. 终点站 2. 终端;终端机3. (电路的)端 子,线接头
山东信息职业技术学院电子工程系
The two basic types of networks are local-area network (LAN) and wide-area network (WAN). A local-area network is two or more computers directly linked within a small area such as a room, building, or group of closely placed buildings. A wide-area network is two or more computers that are geographically dispersed and linked by communication facilities such as the telephone system or microwave relays.
分布式系统 应用层 表示层 会话层 传输层 网络层 数据链路层 物理层 把……叫做
山东信息职业技术学院电子工程系
Computer Networks
Communication between distributed communities of computers is required for many reasons. At a
proliferate 扩散
dominate 在…中占首要地位, 在…中具有最重要(或明显) 的特色;在…中拥有最重要的位置,俯视,高耸于 distributed systems分布式系统
山东信息职业技术学院电子工程系
In general a computer network, as we know today, may be said to have gotten its start with the ARPANET development in the late 1960s and early 1970s. The initial ARPANET design had a definite structure of network architecture and introduced another key concept: protocol layering. Much of our present knowledge about network is a direct result of the ARPANET project.
山东信息职业技术学院电子工程系
计算机网络的优点(网络的主要功能)
The benefit of network is that it can transmit information rapidly and easily among widely separated people; people can share hardware and software resources on the network; a computer network can also provide high reliability by having alternative source of supply.
communication 通信 located in … 位于,坐落于 exchange
交换, 互换, 交流
山东信息职业技术学院电子工程系
say
adv 比方说,例如
Similarly, at a local level within, say, a single building or establishment, distributed communities of computer-based workstations use local communication networks to access expensive shared resources--for example, printers, copiers, disks, tapes, etc.--that are also managed by computers.
山东信息职业技术学院电子工程系
Unit Twelve Computer Networks
What is the computer networks? What are the benefits of computer network?
山东信息职业技术学院电子工程系
山东信息职业技术学院电子工程系
New Words and Expressions community [ kə'mju:niti ] n.公社,团体,共有,一致 exchange [ iks'tʃeindʒ ] v.交换 access [ 'ækses] n. 存取,接近,访问 proliferate [ prəu'lifəreit ] v.增生扩散 dominate [ 'dɔmineit ] v.支配,占优势 terminal [ 'dɔmineit ] n.终端 initial [ i'niʃəl ] adj. 最初的,初始的 definite [ 'definit ] adj.明确的,一定的,有限的
national level, for example, computers located in different pats of the country use public communication services to exchange electronic messages (mail) and to transfer files of information from one computer to another.
山东信息职业技术学院电子工程系
protocol [ 'prəutəkɔl ] n. 协议 formulate [ 'fɔ:mjuleit ] v. 明确地表达,阐明 coordination [ kəuɔ:di'neiʃən ] n.协调,协同,一致 evolve [ i'vɔlv ] v.发展,进展,进化 perspective [ pə'spektiv ] n. 观点,看法,远景 reliable [ ri'laiəbl ] adj. 可靠的,可信赖的 geographically [ dʒiə'ɡræfikəli] adj. 地理上的 facility [ fə'siliti ] n. 设备,工具 alternative [ ɔ:l'tə:nətiv ] adj.可选择的,可替换的
Fig.12-1 The Model of OSI
Fig.12-1 The Model of OSI
山东信息职业技术学院电子工程系
A network is a series of points interconnected by communication lines, located at the points are computer, switching devices, and/or user terminals. A typical network includes the following components: host computers, nodes, terminal controllers, and terminals.
山东信息职业技术学院电子工程系
distributed systems Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer be termed
network architecture 网络构架(框架) key concept 主要(关键)概念 protocol 协议( 网络通信过程中对等层间的约定)
山东信息职业技术学院电子工程系
The ISO, in the late 1970s, formulated a reference model to provide a common basis for the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another. The ultimate aim was to allow an application process in any computer that supported the applicable standards to freely communicate with an application process in any other computer supporting the same standard, irrespective of its origin of manufacture. This model was termed the ISO Reference Model for Open System Interconnection (as shown in Fig.12-1). It should be stressed, however, that this model is not concerned with specific applications of computer communication networks. Rather, it is concerned with the structuring of the communication software that is needed to provide a reliable, data transparent with the structuring of the communication software that is needed to provide a reliable, data transparent communication service (which is independent of any specific manufacturers equipment or conventions) to support a wide range of applications.
山东信息职业技术学院电子工程系
Clearly, as the range of computer communication networks proliferate, computer to computer communication will expand rapidly and ultimately dominate the field of distributed systems. A communication network is a series of points interconnected by communication lines, located at the points are computers, switching devices, and user terminals.
山东信息职业技术学院电子工程系
ISO Reference Model for Open System Interconnection ( OSI/RM)
Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer Application Layer Presentation Layer Session Layer Transportation Layer Network Layer Data-link Layer Physical Layer
可选择的可替换的山东信息职业技术学院电子工程系distributedsystems分布式系统applicationlayer应用层sentationlayer表示层sessionlayer会话层transportationlayer传输层networklayer网络层datalinklayer数据链路层physicallayer物理层betermed把
典型的计算机网络包括: 主机,节点,终端控制器和终端 terminal adj. 1. 末端的, 终点的, 极限的2. 末期的, 晚期的 n. 1. 终点站 2. 终端;终端机3. (电路的)端 子,线接头
山东信息职业技术学院电子工程系
The two basic types of networks are local-area network (LAN) and wide-area network (WAN). A local-area network is two or more computers directly linked within a small area such as a room, building, or group of closely placed buildings. A wide-area network is two or more computers that are geographically dispersed and linked by communication facilities such as the telephone system or microwave relays.
分布式系统 应用层 表示层 会话层 传输层 网络层 数据链路层 物理层 把……叫做
山东信息职业技术学院电子工程系
Computer Networks
Communication between distributed communities of computers is required for many reasons. At a
proliferate 扩散
dominate 在…中占首要地位, 在…中具有最重要(或明显) 的特色;在…中拥有最重要的位置,俯视,高耸于 distributed systems分布式系统
山东信息职业技术学院电子工程系
In general a computer network, as we know today, may be said to have gotten its start with the ARPANET development in the late 1960s and early 1970s. The initial ARPANET design had a definite structure of network architecture and introduced another key concept: protocol layering. Much of our present knowledge about network is a direct result of the ARPANET project.