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Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
Computer Networks
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Computer Networks

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

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