1. Ahmed Nabizadeh

4. A Wide Area Network (WAN) is a telecommunication network that covers a broad area (i.e., any network that links across metropolitan, regional, or national boundaries). Business and government entities utilize WANs to relay data among employees, clients, buyers, and suppliers from various geographical locations..

5. Data transmission, digital transmission, or digital communications is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibers, wireless communication channels, and storage media.

6. In computer networking and computer science, the words bandwidth, network bandwidth, data bandwidth, or digital bandwidth are colloquial and metaphoric terms widely used in textbooks as well as scientific papers, patents and standards to refer to various bit- rate measures, representing the available or consumed data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc.).