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P eer to Peer networks and Performance

This course explores the theoretical background and advanced material of Peer-to-Peer networks, with the objective of studying P2P networks and opening doors for research in this area. The course structure includes lectures by the teacher and students, and students are required to give a presentation on a research paper. The course also covers the importance and impact of P2P networks in the Internet infrastructure.

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P eer to Peer networks and Performance

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  1. Peer to Peer networks and Performance Hanoch Levy (hanoch at cs.tau.ac.il) Office: Kaplun 511 Office hours: by appointment H. Levy P2P+Performance

  2. Course Information Lectures: Wed 9-12 Shreiber 8 Web site: http://www.cs.tau.ac.il/~hanoch/ And follow the link: Advanced topics in Computer-Networks – Peer-to-Peer Networks H. Levy P2P+Performance

  3. Course Objective • Study P2P networks • Open the door for research in this area (Master/ Ph.D) • Cover both: Theoretical background and advanced material H. Levy P2P+Performance

  4. Course Approach • Prerequisites: Course in computer Networks/ Equivalent / teacher approval • Requirements: • Most material is New (articles) • Requires some analytic models • Approach: • Theoretical background (performance: elementary queueing theory) – frontal lectures by teacher. • Recent material: (articles) – lectures by students H. Levy P2P+Performance

  5. Course Structure and requirements • First half of semester: Teacher lectures • 2nd half of semester – student lectures. • Each student gets one paper – and covers one paper in 45 minutes. H. Levy P2P+Performance

  6. Course requirements • First half (theoretical): In Class Exam (50-60% of grade) • exam time: see Mazkirut • HW assignments • 2nd Half: Give a good lecture. (40-50% of grade) • Active participation will benefit a bonus • Overflow students (if any): lecture can be replaced by special assignment by lecturer. H. Levy P2P+Performance

  7. Course Information Supporting Books (theoretical part) • Queueing Theory, L. Kleinrock, Vol I, Wiley (hard copy) • Online books: • Web site: http://web2.uwindsor.ca/math/hlynka/qonline.html(search“queueing hlynka) • Introduction to Queueing Theory (2nd edition). Robert B. Cooper. 1981. 347 pp. This classic book is available on line through Robert Cooper's home page. The link to the book is: http://www.cse.fau.edu/~bob/publications/IntroToQueueingTheory_Cooper.pdf The solution manual (by Borge Tolt, 182 pages, 1981) is available online athttp://www.cse.fau.edu/%7Ebob/publications/QueueingTheory_solns.pdf H. Levy P2P+Performance

  8. Course Information Supporting Books (theoretical part – cont ) • 3. Queueing Theory. Ivo Adan and Jacques Resing. 2001. 180 pp. • 4. Queues: –A Course in Queueing Theor. Moshe Haviv. October 1, 2009. New and complete. • 5. more… H. Levy P2P+Performance

  9. Motivation • Last 10-15 years: communications revolution • Internet + Computer communications • Is a key factor of the Information revolution • Implications • A drastic change of some aspects of life • Revolution is affected by life • Technology drives applications • Applications drive technology H. Levy P2P+Performance

  10. Motivation (cont) • Applications / technology / research  rapidly change over time • If want to stay in frontier: • => Research material very dynamic • => Course material very dynamic H. Levy P2P+Performance

  11. Objectives • Computer Networking course: Internet infra-structure • 1 Introduction and Layering • 2 Physical Layer, Data Link Layer, MAC Protocols • 3 Hubs, Bridges, SwitchesData Link Layer • 4 Switching UnitsSTP, Switching Fabric • 5 Scheduling: Buffer Management Scheduling, WFQ example • 6 Network Layer: RoutingRouting • 7 Reliable Data TransferIP • 8 End to End ProtocolsARQ • 10 Flow Control, Congestion ControlTCP flow & congestion control • 11 Network SecurityNetwork Sniffing (no slides) • 12 DNS, HTTPTCP (state chart) • 13 DDoS • ALL – operations of network of networks. H. Levy P2P+Performance

  12. Objectives (2) • Advanced Material – network development following technology • Peer to Peer (P2P): Bittorent, Skype • Songs /movies / video-on-demand/video online H. Levy P2P+Performance

  13. Internet Physical Infrastructure Residential access Cable Fiber DSL Wireless ISP Backbone ISP ISP • The Internet is a network of networks • Each individually administrated network is called an Autonomous System (AS) Campus access, e.g., • Ethernet • Wireless H. Levy P2P+Performance 13

  14. Data Networks • Set of interconnected nodes exchange information • sharing of the transmission circuits= "switching". • many links allow more than one path between every 2 nodes. • network must select an appropriate path for each required connection. H. Levy P2P+Performance

  15. Real Network H. Levy P2P+Performance

  16. Peer to Peer – what is it? • “Historical” Internet : send data from A to K. • Client-server model: • A = server = data source • K = client data consumer • If C wants too – get from A (unicast or broadcast) H. Levy P2P+Performance

  17. Peer to Peer – what is it • A (source) sends to K. • K (client) may become now a server. • K sends to C (another client). H. Levy P2P+Performance

  18. Peer to Peer – what the diff? H. Levy P2P+Performance

  19. Peer to Peer – what the diff? 80%!!!! H. Levy P2P+Performance

  20. Peer to Peer – How important • 0% of costs • O(0)% of revenues • 0% of planning •  “Nothing” • BUT: 80% of traffic •  cannot disregard… •  If you can’t beat them, join them… H. Levy P2P+Performance

  21. Peer to Peer – Historical View • Networks developed for 40+ years • Internet– started developing late 70’s early 80’s • Distributed, Semi Organized • ATM– developed throughout the 90’s • huge amount of money!!! • Very well organized network • “failed” • P2P – started in the 00’s • VERY unorganized • 80% of traffic (though SMALL % of money) H. Levy P2P+Performance

  22. Peer to Peer – WHY?? • Legal (this is how it started…) • Broadcast is not really implemented • A is bottleneck • Resource Utilization: K is idle X% (95?)of the day • Communications (costs!!) • CPU • Scalability • Issues: • BW cost? Free ride? • Files? Video on demand? Stream (video Broadcast) H. Levy P2P+Performance

  23. Questions for this course • Is it viable? Does it have life of itself? • Can it survive without economy? • Can you carry 80% of traffic without make charges? • Are users (clients) going to let it go? • Are ISP’s going to be happy? • Can 80% go unnoticeable without economic bodies “join the party” • E.g – will ISP take advantage of it? • Is it the right way to plan a net? H. Levy P2P+Performance

  24. Theory • Many network models – based on stochastic modeling • Queueing systems • Stochastic processes • P2P models – included • Objective: study basic stochastic / queueing models • Elementary Queueing theory H. Levy P2P+Performance

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