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Power-Point-Preswntation on "OSI MODEL" …

Power-Point-Preswntation on "OSI MODEL"
(For Nirakar Panda)

More in: Technology
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Transcript

  • 1.  
  • 2. CONTENTS
    • OSI model
    • OSI Layers
    • Interaction between layers
    • Data Exchange
    • Headers and Trailers
    • Conclusion
  • 3. OSI MODEL
    • An ISO standard covering all aspects of network communications
    • Allows different systems to communicate regardless of their underlying architecture or supplier
    • Ensures complete transparency between otherwise incompatible systems
    • Consists of seven different layers each defining a segment of the process of moving info. across a network
  • 4. OSI MODEL PHYSICAL DATA LINK NETWORK TRANSPORT SESSION PRESENTATION APPLICATION
  • 5. INTERACTION BETWEEN LAYERS
  • 6. DATA EXCHANGE
  • 7. HEADERS & TRAILERS
    • Each layer adds its own information to the message it receives from the layer just above it
    • On the receive side, layers strip information added on peer layer of transmit side before passing the message to next higher layer
    • Added “control data” is placed to the beginning (header) or/and end of a data packet (trailer)
    • The whole package is passed to the layer just below it
    • Headers are added to the message at layers 6, 5, 4, 3, and 2. A trailer is added only at layer 2
    • Examples of header info: checksum, sender/receiver address, service type
  • 8.
    • Purpose: Coordinates the functions required to transmit and receive streams of bits, over physical communication medium
    • Major issues:
      • ·  what type of signals & how are bits represented by signals?
      • ·  what physical medium & interface to use?
      • ·  How bits are synchronized in Tx and Rx?
    PHYSICAL LAYER
  • 9. DATA LINK LAYER
    • Purpose: error-free delivery of frames between two systems on the same network (Node-to-Node)
    • Major issues:  
    • what information goes into header/trailer & how are stations addressed?
    • how are transmission errors detected and corrected?
    • how is transmission flow between stations regulated?
    • how is access to “shared transmission channel” regulated?
  • 10. NODE-TO-NODE DELIVERY
  • 11. NETWORK LAYER
    • Purpose: source to destination delivery of packet , possibly across multiple networks 
    • Major Issues : 
    • what info goes into header?
    • how is packet routed from source to destination? 
  • 12. SOURCE TO DESTINATION DELIVERY
  • 13.
    • Purpose: error free source to destination delivery of (entire) messages
    • Major Issues :
    • how is message segmented into packets?
    • how are packets reassembled into messages?
    • how are packets delivered to correct port address?
    • how is the connection between source and destination established?
    TRANSPORT LAYER
  • 14. PROCESS-TO-PROCESS MESSAGE DELIVERY
  • 15. SESSION LAYER
  • 16. PRESENTATION LAYER
  • 17. APPLICATION LAYER
  • 18. SUMMARY OF LAYER FUNCTIONS
  • 19. CONCLUSION
    • The International Standard Organization created a model called the
    • open system interconnection
    • It allows diverse systems to communicate
    • The seven layer OSI model provides guidelines for the developments
    • universally compatible networking protocol
  • 20.