003+11-17-11+-+Chapter+8

003+11-17-11+-+Chapter+8 - Chapter 8 Networking and...

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Slide 1 Chapter 8 Networking and Telecommunication
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Slide 2 Chapter 8 Objectives Describe the basic types of technology that make telecommunication possible Describe the nature and function of local-area networks and wide-area networks Discuss the uses and implications of email, instant messaging, teleconferencing, and other forms of online communication
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Slide 3 Chapter 8 Arthur C. Clarke’s Magical Prophecy Clarke’s laws If an elderly but distinguished scientist says that something is possible, he is almost certainly right , but if he says that it is impossible he is very probably wrong The only way to find the limits of the possible is to go beyond them into the impossible Any sufficiently advanced technology is indistinguishable from magic
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Slide 4 Chapter 8 Arthur C. Clarke’s Magical Prophecy Arthur C. Clarke’s most famous work was the monumental 1968 film 2001: A Space Odyssey , in which he collaborated with movie director Stanley Kubrick Clarke’s most visionary work may be a paper published in 1945 in which he predicted the use of geostationary communications satellites - satellites that match the Earth’s rotation so they can hang in a stationary position relative to the spinning planet below, relaying wireless transmissions between locations on the planet
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Slide 5 Chapter 8 Basic Network Anatomy Specialized Networks: From GPS to Financial Systems Global Positioning System (GPS) Specialized network developed by U.S. Department of Defense Includes 24 satellites that circle the Earth Each satellite contains a computer, an atomic clock, and a radio On the ground, a GPS receiver can use signals broadcast by three or four visible satellites to determine its position
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Slide 6 Chapter 8 Basic Network Anatomy A computer network is any system of two or more computers that are linked together How is networking important? People share computer hardware, thus reducing costs People share data and software programs, thus increasing efficiency and production People work together in ways that are otherwise difficult or impossible
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Slide 7 Chapter 8 Basic Network Anatomy Networks Near and Far A local area network (LAN) : computers are physically close to each other, usually in the same building In a wireless network each node has a tiny radio (or, less commonly, infrared) transmitter connected to its network port Sends and receives data through the air rather than through cables Computers are linked within a building or cluster of buildings Each computer and peripheral is an individual node on the network Open vs. Closed Wireless Networks Con: Security risks Pro: “To me, it's basic politeness. Providing internet access to guests is kind of like providing heat and electricity, or a hot cup of tea. ” – Bruce Schneier , Wired .
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Slide 8 Chapter 8 Basic Network Anatomy Metropolitan area network (MAN) links two or more LANs within a city A
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003+11-17-11+-+Chapter+8 - Chapter 8 Networking and...

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