Web Science

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Introduction (0th week)

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Web Science/Part1: Foundations of the web

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Lessons

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  1. understand the basic problems when communicating over a shared medium
  2. understand the origins of ethernet
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  • be able to name the ethernet header fields
  • be able to explain the reason for the preamble
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  • 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
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  • Understand that Ethernet is a non deterministic program
  • Be able to reconstruct a collsition detection / resolve algorithm
  • Understand what happens if two computers send data at the same time
Web Science MOOC Exercises Week 1.pdf
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  • get introduced to the concept of an IP-network
  • understand that networks can be interconnected
  • learn about the importance for decentralization as a design principle
  • realize that Local area networks can be fragmented via IP networks
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  • understand that an IP network as an overlay network is an abstract thing that is not directly reflecting the hardware settings
  • understand the notion of an IPv4 address and its components like network and host part
  • understand why MAC addresses do not fulfill the requirements of IP addresses.
  • get introduced to the notion of an IP router / gateway
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  • review the definition and concept of an IP network
  • understand that IP routing works on the level of IP networks
  • understand the concept of subnetting
  • review network classes and understand classless inter domain routing.
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  • get a feeling for the IP header
  • get a better understanding of how the protocol works
  • understand which header fields are changed while routing
Web Science MOOC Exercises Week 1.pdf
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