Introduction to Computer Networks

Effectiveness of a data communications system

Five components of a Data Communications System

  1. Message : The message is the information (data) to be communicated.

  2. Sender : The sender is the device that sends the data message.

  3. Receiver : The receiver is the device that receives the message.

  4. Transmission media : The transmission medium is the physical path by which a message travels from sender to receiver. Some examples of transmission media include twisted-pair wire, coaxial cable, fiber-optic cable, and radio waves.

  5. Protocol : A protocol is a set of rules that govern data communications. It represents an agreement between the communicating devices.

Three Types of Data Flow


Type of Connections in Networks

Categories of Networks

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