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Computer Networks

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  • Transcript

    • 1. COMPUTER NETWORKS Jisha Das
    • 2. NETWORK
      • 2 or more computers that are linked:
        • to share resources
        • exchange files
        • allow electronic communications
    • 3.
      • Computers on a network maybe linked through :
        • Cables
        • Telephone lines
        • Radio waves
        • Satellites
        • Infra red light beams
    • 4. TYPES OF NETWORK
      • LAN : is a network that is confined to a small area.
      • WAN : connect larger geographic areas.
      • MAN: connect within a city or metropolis
    • 5.
      • Internet : is a network that links hundreds of thousands of networks all over the world, which in turn service individual PC’s or host computers.
      • Intranet : private networks using Internet networking standards and Web technology.
    • 6. NETWORK COMPONENTS
      • Hardware
        • Transmission facilities
        • Access devices: Ethernet Card
        • Devices that repeat transmitted signals HUB
      • Software
        • Protocols
        • Device drivers
        • Communication software
    • 7. Ethernet Card
    • 8. HUB HUB
    • 9. USER VIEW OF COMPONENTS
      • Servers
      • Clients
      • Circuit
    • 10. TOPOLOGY
      • How computers are connected together.
        • STAR TOPOLOGY
        • RING TOPOLOGY
        • BUS TOPOLOGY
    • 11. STAR TOPOLOGY
    • 12. BUS TOPOLOGY
    • 13. Communication Media
      • Unshielded Twisted Pair (UTP) Cable
      • Coaxial Cable
      • Fiber Optic Cable
      • Wireless
    • 14. Wireless
      • Microwave
        • Terrestrial
        • Satellite
      • Radio
      • Infrared
      • Lasers
    • 15. Protocols rules that govern the communication process
    • 16. OSI REFERENCE MODEL
    • 17.
      • Defined by the international standard organisation
      • A set of protocols in a hierarchical order which all std. protocols follow.
      • A reference, not mandatory
      • 7 layers
    • 18.
      • PHYSICAL LAYER : nature of & specifications of physical components
      • DATA LINK LAYER : Organizing the data
      • NETWORK LAYER : where to sent the message
      • TRANSPORTATION LAYER : reliable transmission of data
      • PRESENTATION LAYER: user interfaces across different platforms
      • APPLICATION LAYER: sets up standards for applications.
    • 19. REFERENCES
      • http://fcit.usf.edu/Network/
      • http://www.webopedia.com/quick_ref/OSI_Layers.asp
      • www.wikipedia.com
      • Sir’s ppt on NETWORKS