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Sunday, May 27, 2007

Computer Networks

some definitions:
  1. Telecommunication : (tele means far) means communication at a distance which includes telephone, telegraph, television.
  2. Data: It refers to the fact, concepts and instructions presented in whatever form agreed upon by the parties.
  3. Data Communication : Exchange of data between two devices via some form of transmission medium.

Fundamental Characterstics of Data Communication:

  • Delivery: system must deliver data to correct destination
  • Accuracy: system must deliver data accurately, unaltered.
  • Timeliness: Data delivered without significant delay will be useless. like in video conferencing.

Components of Data Communication:

  1. Message : the information/data
  2. Sender: device that sends messages
  3. Receiver: device that receives messages
  4. Medium: physical path by which data travels
  5. Protocol: set of rules that govern data communication

NETWORK : set of nodes connected by communication links.

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