PEER TO PEER AND WIRELESS NETWORKS E LABORATORIO

Academic Year 2021/2022 - 2° Year - Curriculum Sistemi di Rete e Sicurezza

Learning Objectives

• Peer to peer and wireless networks

  Knowledge and understanding: the aim of the course is to acquire advanced knowledge that allow the student to understand theoretical mechanisms which constite the base for a distributed communication protocol; in detail, the student will acquire knowledge of main P2P and wireless networks protocols.
  
  Applying knowledge and understanding: student will acquire knowledge usefull to design a distributed coordination protocols specific for an Overlay Network, defining suitable feature to promote collaboration, optimizing , at the same time, the exploitation of the shared resources. For this reason, a part of the course will be held in laboratory, with lessons dedicated to the study of the NS2 simulator, in order to allow performance evaluation of a network protocol.
  
  Making judgements: the study cases presented, based on real network protocols, will allow the student to discover limits and errors of their design; this will be the basis for autonomously developing of new solutions, going beyond restrictions due to scalability in distributed systems.
  
  Communication skills: student will acquire advanced communication skills using technical language in the field of network protocols and distributed systems.
  
  Learning skills: the course provides, to the student, teoretical and practical methodologies in order to deal with new problems that can rise during designing activity.
  
  Note: should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the programme planned and outlined in the syllabus.
  Learning assessment may also be carried out on line, should the conditions require it.
  
  

• Laboratory of Peer to peer and wireless networks

  Knowledge and understanding: the aim of the course is to acquire advanced knowledge that allow the student to evaluate the performance of a distributed communication protocol.
  
  Applying knowledge and understanding: student will acquire knowledge usefull to design a distributed coordination protocols specific for an Overlay Network, defining suitable feature to promote collaboration, optimizing , at the same time, the exploitation of the shared resources. For this reason, a part of the course will be held in laboratory, with lessons dedicated to the study of the NS2 simulator, in order to allow performance evaluation of a network protocol.
  
  Making judgements: the study cases presented, based on real network protocols, will allow the student to discover limits and errors of their design; this will be the basis for autonomously developing of new solutions, going beyond restrictions due to scalability in distributed systems.
  
  Communication skills: student will acquire advanced communication skills using technical language in the field of network protocols and distributed systems.
  
  Learning skills: the course provides, to the student, teoretical and practical methodologies in order to evaluate new network protocols.

  Note: should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the programme planned and outlined in the syllabus.
  Learning assessment may also be carried out on line, should the conditions require it.
  
  

Course Structure

• Peer to peer and wireless networks

  Classroom lessons

  Laboratory lessons

• Laboratory of Peer to peer and wireless networks

  Laboratory lessons

  Practice exercises in laboratory

Detailed Course Content

• Peer to peer and wireless networks

  The Clien-Server model vs the P2P model
  The overlay networks
  Origin of the P2P

  Properties of the P2P networks
  Network typology: pure, hybrid,structured, DHT, hierarchical, decentralized
  Case of study:

  • Napster
  • Gnutella 0.4
  • Edonkey, Gnutella 0.6, Gnutella 2 FastTrack, OpenFT
  • Emule
  • Freenet
  • Chord, Pastry

  Wireless networks
  Wired vs wireless
  Implicit limitation of the wireless system
  New Application in wireless
  Taxonomy
  Introduction to phisical layer: channel access problem
  The CSMA/CA solution
  IEEE 802.11: BSS, ESS, IBSS structures
  Structured and AdHoc Networks
  Phisical and virtual carrier sensing
  The IEEE 802.11 standard
  The DCF
  MACAW, NAV, RTS/CTS, DS
  Temporarization in 802.11: SIFS, PIFS, DIFS, EIFS
  The PCF
  Structure of the IEEE802.11 frames
  MAC Addresses
  Case of study: Theoretical performance of a TCP transmission over IEEE802.11
  Routing protocols
  Mobile IP
  Routing protocols in MaNet:

  • DSR,
  • AODV,
  • DSDV
  • LRA

  TCP: Congestion control
  TCP variations

  • Tahoe
  • Reno
  • New Reno
  • Vegas
  • SACK
  • Westwood
  • Veno
• Laboratory of Peer to peer and wireless networks

  Introduction to discrete-events simulations
  Performance evaluation in a network
  The NS3 simulator
  Performance evaluation of a network connection using TCP Tahoe, TCP Reno, TCP new Reno
  Simulations over a MaNET with NS3

Textbook Information

• Peer to peer and wireless networks

  See "didactical material" into Studium
  

• Laboratory of Peer to peer and wireless networks

  NS3 reference manual.