Computer Networks
some definitions:
- Telecommunication : (tele means far) means communication at a distance which includes telephone, telegraph, television.
- Data: It refers to the fact, concepts and instructions presented in whatever form agreed upon by the parties.
- 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:
- Message : the information/data
- Sender: device that sends messages
- Receiver: device that receives messages
- Medium: physical path by which data travels
- Protocol: set of rules that govern data communication
NETWORK : set of nodes connected by communication links.
Labels: communication, message, networks