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CISSP in 21 Days by M. L. Srinivasan

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Network architecture, protocols, and technologies

Communication is the process of transmitting information from one entity (sender) to another entity (receiver) through the use of a medium. The information may be in a written format, a spoken language, or in a sign language. The medium can be physical, such as a sender using post card to send information to receiver. The post card is transported physically by post offices. The medium can be the atmosphere as in spoken conversations.

Telecommunication, in similar terms, transmits information from entities such as people, phones, or computers to entities such as people, phones, or computers. The medium used in telecommunications is either cables or wires, or the atmosphere as in wireless connections. ...

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