CCNA Discovery 1, Chapter 3
3.2.1–3.2.8: Communication requires a source or sender, destination, and channel or pathway. As soon as you have a source, destination, and path, the next step is to develop a protocol for communication. The protocol defines the format, size, timing, encapsulation, encoding, and pattern for a message. In network communication the message is encoded into bits represented by electrical pulses and sound. A computer transmission is formatted as a frame. Figure 25-1 identifies the general fields of a frame.
Figure 25-1. Generic Frame
If a data message is large, the communication protocol breaks it into multiple frames. ...
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