module.3.session.3.b.handouts

module.3.session.3.b.handouts - 10/18/2009 Module 3:...

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10/18/2009 1 Session 3b: The Web, The Internet, and Network Tech 2 What do you use a computer for? How many of those activities can you still do when “the network is down”? Networking technologies are central to how we use computers 3
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10/18/2009 2 Why do you need to know about this? Effectively using IT requires that you provide: Specification Describing what you need Justification Providing a rationale for why you need it Explanation Describing what happened Technical concepts are central to all of these 4 5 6
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10/18/2009 3 Communication media are any material substances which can support transmission of a signal from one device to another Wired communications media transmit information over a closed, connected path Wireless communications media transmit transmit information through the air 7 Twisted-pair cable – bundles of copper wires for transmitting voice or data Cat 5 and Cat 5e are common for modern networks Coaxial cable (coax) – one central wire surrounded by insulation, a metallic shield, and a covering of by insulation, a metallic shield, and a covering of insulation Optical fiber – glass or plastic fiber through which pulses of light travel 8 Short Distance Infrared – Infrared light based transmission Bluetooth – Short-range radio used to transmit over distances of up to 30 feet 802.11b,d,e – Wireless Internet modems Medium Distance Microwave – Line-of sight, point-to-point transmission of signals hi h f at high frequency
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module.3.session.3.b.handouts - 10/18/2009 Module 3:...

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