| No | Word | Definition |
| 1 | Data Communication | Data communication is concerned with transferring electronic data from source to destination. |
| 2 | Computer Protocol | A computer protocol defines a set of rules that govern the communication process between communicating entities. |
| 3 | Layered Protocol Architecture | A layered protocol architecture defines the way to break a communication task into subtasks, each of which is implemented in a separate layer in a stack where each protocol belongs to one of the layers in the architecture, and each layer provides its services by performing predefined internal actions and using the services provided by the layer below it. |