ch08 - CHAPTER 8 NETWORKS: COMMUNICATING AND SHARING...

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1 CHAPTER 8 NETWORKS: COMMUNICATING AND SHARING RESOURCES This chapter focuses on the fundamentals of computer networking. As students continue on their journey toward computer fluency, they will need to be informed and literate about networking and know about its benefits and possibilities. This chapter explains the essential concepts of computer networking and teaches the basic networking terms students will need to discuss the subject intelligently. The major sections in this chapter are: 1. Network Fundamentals . The basic components of a network are defined, as are the standards for communicating over a network. The types of networks are identified, and the benefits of networking are explained. This section also covers how modems transform digital computer signals into the analog tones suited for the telephone system. 2. Advantages and Disadvantages of Networking . This section discusses that when you connect two or more computers, you see gains in every aspect of computing, especially with regards to efficiency and costs—reduced hardware costs, application sharing, sharing information resources, centralizing data management, and connecting people. This section also discusses the disadvantages of networking, which include loss of autonomy, lack of privacy, security threats, and loss of productivity. 3. Local Area Networks (LANs) . The basic components of a local area network are identified, including special hardware and software. Various networking models for LANs are explained. LAN topologies and protocols are also introduced. 4. Wide Area Networks (WANs) . Identifies the basic components of a wide area network. This section discusses POPs, backbones, WAN protocols, and WAN technologies. The concepts of packet switching and circuit switching are also discussed in this section. KEY TERMS backbone —In a wide area network (WAN), such as the Internet, a high-speed, high-capacity medium that transfers data over hundreds or thousands of miles. A variety of physical media are used for backbone services, including microwave relay, satellites, and dedicated telephone lines. bus topology —The physical layout of a local area network that does not use a central or host computer. Instead, each node manages part of the network, and information is transmitted directly from one computer to another. circuit switching —A type of telecommunications network in which high-speed electronic switches create a direct connection between two communicating devices. The telephone system is a circuit-switching network. client —In a client/server network, a program that runs on users’ computers and enables them to access a certain type of data. client/server network —A computer network in which some computers are dedicated to function as servers, making information available to client programs running on users’ computers. collision
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This note was uploaded on 07/06/2009 for the course BUS BAM315 taught by Professor Na during the Spring '09 term at 東京大学.

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ch08 - CHAPTER 8 NETWORKS: COMMUNICATING AND SHARING...

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