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Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
Introduction to Peer-to-Peer Networks
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Introduction to Peer-to-Peer Networks

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  • 1. Peer to Peer?? --An introduction.
  • 2. What is Peer to Peer Computing??
    • Peer to Peer is most commonly known as P2P.
    • Definitions:
    • Intel: The sharing of computer resources and services by direct exchange between systems.
    • SETI@home: Director David Anderson says,
    • “ P2P projects that do not involve communication are “inverted client – server”!”
    • Meaning,
    • nodes at the edge provide power and those at the core co-ordinate them.
  • 3. Definitions (cont)
    • Kindberg defines P2P systems as those with independent lifetimes [Kindberg 2002].
    • Finally,
    • P2P is about sharing: giving to and obtaining from a peer community. A peer gives some resources and obtains other resources in return.
  • 4. Selecting P2P approach.
    • The selection of the type of approach to use when working with P2P is mainly based on the user’s need.
    • Cost sharing.
    • Resource aggregation.
    • Improved scalability.
    • Anonymity.
    • Increased autonomy.
    • Dynamism.
  • 5. High level view (P2P Vs. Centralized approach)
  • 6. Intertwined with other technologies.
  • 7. Taxonomy of comp. systems architecture
  • 8. Pure Vs. Hybrid P2P
    • Pure P2P – Totally no centralized server. All peers talk to each other directly.
    • Hybrid P2P .
    • - There is just one server for name resolution purposes only.
    • - Further communications are between the peers directly.
  • 9. Taxonomy of P2P systems.
  • 10. P2P Applications.
  • 11. Applications (cont.)
    • Parallelizable.
    • Computer intensive tasks.
    • - many subtasks across many peers.
    • - all peers performing same task with different values.
    • Componentized applications.
    • - same tasks needing different components.
    • - each peer runs a separate component.
    • e.g., scientific applications like, searching for extraterrestrial life, code breaking etc.
  • 12. Applications (cont.)
    • Content and file management.
    • - storing information on and retrieving information from peers.
    • - data mining, filtering and searching.
    • Collaborative.
    • - shared applications.
    • - viewers can interact while viewing and/or editing the same info.
    • - email, IM, News etc.,
  • 13. P2P system architecture.
  • 14. Architecture (cont.)
    • Communication – cable/ wire oriented connections and wireless connections. Challenge is to overcome the dynamism of mobile peers.
    • Group management – discovery of other peers, location and routing between those peers.
    • Robustness – security , resource aggregation and reliability.
    • Class specific layer – abstracts functionality from each task. E.g.,
    • scheduling – scientific , meta data – content and file mgmt , messaging – collaborative.
    • Application specific layer – applications are performed by corresponding tools like, calendaring, notes, chatting etc.
  • 15. P2P Algorithms.
    • Three algorithms currently used for P2P systems are,
    • - Centralized Directory Model.
    • - Flooded Requests Model.
    • - Document Routing Model.
    • Centralized directory model.
    • matching based on request type.
  • 16. Algorithms (cont.)
    • Flooded requests model .
    • - pure P2P.
    • - all peers flood every connected peer with requests till,
    • * the maximum number of requests is reached.
    • * the peer with that capability responds.
  • 17. Algorithms (cont.)
    • Documents routing model.
    • - Each peer is assigned an ID.
    • - When a document is published (shared), it is assigned an ID.
    • - When routing, the Peer that has the application matching the contents of the document ( based on which ID was created), is routed and sent the document .
  • 18. Case studies.
    • Distributed computing.
      • Avaki
      • SETI@home (search for extraterrestrial intelligence)
  • 19. Case studies (cont.)
    • Collaboration.
    • - groove. - magi
  • 20. Case studies (cont.)
    • Content distribution.
    • - Freenet.
    • - gnutella.
    • Platforms.
    • - GXTA.
    • - .NET

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