IS CHapter 6

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IS CHapter 6
2011-10-16 01:27:30

IS chapter 6
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  1. Data Communication
    electronic tranfer data from one connection to another
  2. Networks
    a communications, data exchange, resouce sharing system created by linking two or more devices
  3. Convergence
    telephone and computer network converging into a single digital network
  4. 3 Major Types of Networks
    • LANs-Local area networks
    • WANs-Wide area networks
    • MANs-Metropolitan area networks
  5. LANS
    • 100Mbps to 10 Gbps
    • client server or peer to peer model
  6. WANS
    • span several cites, states , countries
    • owned by different parties
    • connect to other networks
  7. MANs
    • cities and sometimes nearby cities
    • community services
  8. What is a computer Network
    • NICS
    • NOS
    • sending receiving devices
    • other connecting HW
    • connection/transmission media
    • protocols
  9. Sender Receiver Devices
    • "thin client" -dumb terminal
    • portable personal using devices
  10. NICS
    Network Interface Cards
    HW that enables computers to work over networks
  11. NOS
    Network Operation System
    runs coordinates a network
  12. Protocols
    rules or governs transmissions information between two points
  13. HTCP/IP
    Transmission Control Protocol
    Internet Protocol
    • TCP-establishes the connection between two computers
    • IP-delivers/reassembles/disassembles packets
  14. Packet
    -collection of binary digits
  15. packet switching
    when the sending computer divides the message into packets
  16. router
    • HW containing software
    • connects networks and contains traffic between them
  17. HUB
    • HW devices that contain all other network components
    • sends packets of data to all conncected devices
  18. Switch
    • more intelligence than a HUB
    • can filter and forward data to a specified destination of network
  19. modem
    convert analog signals to digital
  20. analog signal-continous curving signal
    digital signal-a signal represented by bits
  21. speed
    • measured in bps
    • bits per second
  22. bandwith
    amount of data that can be transferred from one point to another in a certain time period
  23. narrowband
    voice grade transmission capable of 56,000 bps
  24. broadband
    • high speed internet
    • 200 kilobytes per second
  25. attenuation
    loss of signal when it goes from sender to receiver
  26. EMI
    electro magnetic interferance
    interferance caused by flouresent lights
  27. transmission media/communication media
    • also called channels
    • used to carry the signals between devices
    • physical media- wired, guided, cable
    • wirless media-radiated, unguied,broadcast
  28. physical media
    • physical path along which signals are transmitted
    • twisted wire cable
    • coaxial cable
    • fiber optics
  29. Twisted Wire
    • advantages
    • high availabitlity
    • low cost
    • known technology
    • disadvantages
    • low data
    • interferance
    • secuirty
    • greater capacity (bandwith)
    • faster
    • less interferance
    • not as available
    • more expensive
    • security
  31. Fiber optics
    • high bandwith
    • fits into small pieces
    • no atenuation
    • very secure
    • no interferance
    • more costly
    • more difficult to install
  32. Wireless Media
    • transmission through air or water
    • infrared light
    • high frequency radio
    • microwave/satellite trasmission
  33. RFID
    uses passive or active tags in the form of chips or smart labels that can unique identifiers and relay this info to electronic readers
  34. RFID tag
    contains a microchop or attenea, serial number radio waves to electronic readers
  35. Hotspots
    one or more access points in public places to provide wireless coverage for an area
  36. WiMax
    range of about 30 miles
  37. microwave
    • high frequency radio signal that is sent through the air or terristial or satellite signals
    • high winds, heavy rain,EMI are also problems
  38. satellite microwave
    • transfer signal
    • orbiting the earth
  39. GPS
    24 hour well spaced satellites that orbit the earth and make it possible for people with ground receivers to pinpoint their geogrpahic location.
  40. Network Topologies
    • Bus-open ended line with all nodes or workstations connected to the bus individually
    • Ring-node connecting to the next node, travel in one direction
    • Star-nodes or workstations connected to a central hub through which all messages pass
  41. internet
    • worldwide of millions of computers
    • started in 1969 as a defense project called avanced research projects agency networks
  42. WWW
    • largely text based as internet.
    • using hypermedia
    • embedded references used in hypermedia are called hypertext
    • HTTP-the internet protocol supports the exchange of info
  43. URL
    uniform resouce locator
    • identifies a web page
    • includes the domain name parts
    • linked to the specific IP address
  44. domain name
    unique identifier of computer or network addresses on the internet
  45. IP
    internet protocol
    • each domain is associated with one or more IP addresses
    • 32 bit address
    • Domain names are converted to IP addresses
  46. registrars
    companies that can register domain names
  47. internet services
    • email
    • chatting and instant messaging
    • world wide web
  48. VOip
    call digitalizes and breaks ups a voice message into data packets that travel along different routes
  49. VPN
    private network of computers using a secure tunnel
  50. Search Engines
    • started in early 1990s
    • three step processing
    • crawling
    • indexing
    • searching
  51. Web 2.0
    more interactive than traditional webs
  52. WEB 3.0
    • more evolution into 3D application
    • more use of the web into database
  53. intranet
    • coporate portals
    • uses protocols and technologies
  54. extranet
    • secure network
    • allows authorized outside users