COMPUTER NETWORKS Jisha Das
NETWORK <ul><li>2 or more computers that are linked: </li></ul><ul><ul><li>to share resources  </li></ul></ul><ul><ul><li>...
<ul><li>Computers on a network maybe linked through :  </li></ul><ul><ul><li>Cables  </li></ul></ul><ul><ul><li>Telephone ...
TYPES OF NETWORK <ul><li>LAN : is a network that is confined to a small area. </li></ul><ul><li>WAN : connect larger geogr...
<ul><li>Internet : is a network that links hundreds of thousands of networks all over the world, which in turn service ind...
NETWORK COMPONENTS <ul><li>Hardware </li></ul><ul><ul><li>Transmission facilities </li></ul></ul><ul><ul><li>Access device...
Ethernet Card
HUB HUB
USER VIEW OF COMPONENTS <ul><li>Servers </li></ul><ul><li>Clients </li></ul><ul><li>Circuit </li></ul>
TOPOLOGY <ul><li>How computers are connected together. </li></ul><ul><ul><li>STAR TOPOLOGY </li></ul></ul><ul><ul><li>RING...
STAR TOPOLOGY
BUS TOPOLOGY
Communication Media <ul><li>Unshielded Twisted Pair (UTP) Cable </li></ul><ul><li>Coaxial Cable </li></ul><ul><li>Fiber Op...
Wireless <ul><li>Microwave </li></ul><ul><ul><li>Terrestrial </li></ul></ul><ul><ul><li>Satellite </li></ul></ul><ul><li>R...
Protocols rules that govern the communication process
OSI REFERENCE MODEL
<ul><li>Defined by the international standard organisation </li></ul><ul><li>A set of protocols in a hierarchical order wh...
<ul><li>PHYSICAL LAYER : nature of & specifications of physical components </li></ul><ul><li>DATA LINK LAYER : Organizing ...
REFERENCES <ul><li>http://fcit.usf.edu/Network/ </li></ul><ul><li>http://www.webopedia.com/quick_ref/OSI_Layers.asp </li><...
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Computer Networks

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  • Computer Networks

    1. 1. COMPUTER NETWORKS Jisha Das
    2. 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. 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. 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. 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. 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. 7. Ethernet Card
    8. 8. HUB HUB
    9. 9. USER VIEW OF COMPONENTS <ul><li>Servers </li></ul><ul><li>Clients </li></ul><ul><li>Circuit </li></ul>
    10. 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. 11. STAR TOPOLOGY
    12. 12. BUS TOPOLOGY
    13. 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. 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. 15. Protocols rules that govern the communication process
    16. 16. OSI REFERENCE MODEL
    17. 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. 18. <ul><li>PHYSICAL LAYER : nature of & 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. 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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