教材名称：《计算机专业英语》 主 编： 来永春 出版时间：
电子教案
第 14 次课 学时 2 Project Three LAN Setup and Connecting it to the Internet 授课题目（章，节） Part A Theoretical Learning Skill Two Network Devices 授课类型（请打√） 理论课□√ 研讨课□ 习题课□ 复习课□ 其他□ 教学目的： 1 In this part, our target is to improve the speed of reading professional articles and the comprehension ability of the reader. 2.We have marked specialized vocabulary key words in some paragraphs so that the reader can quickly grasp the main idea of the sentences and paragraphs. 教学方法、手段： 1. By the computer, projector and blackboard-writing 2. By the student-centered learning, using Classroom Teaching Method, Communicative Teaching Method, Task-based Teaching Method and Audio-visual Teaching Method 教学重点、难点： 1.Master the key words and phrases in the text. 2.Analyze the structure of the complex sentences in the text. 3.Translate the text into Chinese with the help of the reference materials. 3.Describe Network Devices 补充内容和教学内容及过程设计 时间分配 教学设计 Step 1. Learning key words and phrases 20 分钟 repeater n.中继器 hub n.集线器 bridge n.网桥 switch n.交换机 router n.路由器 cable n.电缆 frame n.帧 segment v.分割 gateway n.网关 transmission media n.传输介质 twisted pair n.双绞线 coaxial cable n.同轴电缆 optical fiber n.光纤 NIC（Network Interface Card） 网络接口卡（网卡） MAC（Media Access Control）address 媒体访问控制地址 OSI（Open System Interconnect）reference model 开放式系统互联参考模型 STP（Shielded Twisted-Pair） 屏蔽双绞线 UTP（Unshielded Twisted-Pair） 非屏蔽双绞线 expansion n. 扩展 unique adj. 唯一的 repeater n. 中继器 amplif v. 放大,增强 regenerate v. 再生 segment v. 分割 store-and-forward 存储转发 filter v. 过滤 frame n. 帧 twisted pair n. 双绞线 coaxial adj. 同轴的 optical adj. 光学的 fiber n. 光纤 terrestrial adj. 陆地的 Step 2. Introduction of training target 5分钟
1 In this part, our target is to improve the speed of reading professional articles and the comprehension ability of the reader. 2.We have marked specialized vocabulary key words in some paragraphs so that the reader can quickly grasp the main idea of the sentences and paragraphs. Step 3. Leading in a short introduction to Network Devices 5分钟 Network devices include all computers, media, interface cards and other equipments needed to perform data-processing and communications within the network. Let’s look at some typical network devices. Step 4. Analyzing the structure of the complex sentences 15分钟 1. NICs are considered Layer 2 devices because each individual NIC throughout the world carries a unique code, called a Media Access Control (MAC) address. 2. Repeaters are networking devices that exit at Layer 1, the physical layer, of the OSI reference model. Step 5. Memorizing and mastering the following key sentences in the text. 45分钟 1. The network interface card provides the physical connection between the network and the computer workstation.
2. NIC is a major factor in determining the speed and performance of a network.
3. One of the disadvantages of the type of cable that we primarily use, CAT5 UTP, is cable length.
4. The repeater electrically amplifies the signal it receives and rebroadcasts it.
5. Generally speaking, hub is used when referring to the device that serves as the center of a network
6. The difference is the number of cables that connects to the device. 7. Whereas a repeater receives signal on one port and repeats it on the other, a hub receives signal on one port and transmits it to all other ports.
8. Bridges can be used to connect different types of cable, or physical topologies. 9. Bridges are store-and-forward devices. 10. Bridges filter networking traffic by only looking at the MAC address. 11. Consequently, bridges are concerned only with passing or not passing frames, based on their destination MAC addresses. 12. A switch is a Layer 2 device just as a bridge is. 13. A switch is a Layer 2 device just as a bridge is. In fact, a switch is sometimes called a multi-port bridge, just like a hub is called a multi-port repeater. 14. The router is the first device you work with that is at the OSI network layer, otherwise known as Layer 3. 15. The purpose of a router is to examine incoming packets,choose the best path for them through the network, and then switch them to the proper outgoing port. 16. Routers are the most important traffic regulating devices on large networks. 17. A gateway can translate information between different network data formats or network architectures. 18. Transmission media can be transferred in wired or wireless method. The basic wired media are twisted pair, coaxial cable, and optical fiber. 19. Networking media are considered Layer 1 components of OSI model. 思考题、作业题、讨论题： 1.Review the key words and phrases in the text. 2.Translate the text into Chinese with the help of the reference materials. 3.Complete the exercises involved. 课后总结分析：
计算机专业英语教案--14[3页]
