Web Science/Part1: Foundations of the web/Ethernet

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Web Science | Part1: Foundations of the web
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Learning goals

  1. understand that ethernet is a nondeterministic protocol
  2. be able to understand requirements for the link layer in the TCP/IP Protocol suite
  3. understand the collision detection in ethernet
  4. understand why randomization is a good idea in nondeterministic protocols
  5. be able to name a deterministic link layer protocol

Associated units

File:General Problems of Communication over a Shared Medium.ogvRiproduci file multimediale
Communication over a shared Medium
  1. understand the basic problems when communicating over a shared medium
  2. understand the origins of ethernet
File:How to build an Ethernet Frame.webmRiproduci file multimediale
Ethernet header
  • be able to name the ethernet header fields
  • be able to explain the reason for the preamble
File:Minimum Frame Length in Ethernet explained.webmRiproduci file multimediale
Minimum package length vs maximum cable length
  • understand that the cable length has an influence to transfer rate
  • understand that speed of light is responsible for the connection between cable length and transfer rate
  • be able to calculate the maximum cable length for a given transfer rate
  • understand that the cable length is part of the Ethernet protocol
File:Ethernet Carrier sense multiple access with collision detection.ogvRiproduci file multimediale
Collision detection
  • Understand that Ethernet is a non deterministic program
  • Be able to reconstruct a collision detection / resolve algorithm
  • Understand what happens if two computers send data at the same time
Summary, further reading, homework
no learning goals defined

Further reading

  1. The Webs Awake (An Introduction to the Field of Web Science and the Concept of Web Life by Philip D. Tetlow.
  2. Foundations and Trends in Web Science, Volume 1 Issue 1 by Tim Berners-Lee, Wendy Hall, James A. Hendler, Kieron O'Hara, Nigel Shadbolt and Daniel J. Weitzner.