Fitzgerald, J., Dennis, A., & Durcikova, A. (2017). Business data communications and networking (13th ed.). 9781119368847.
Read Chapters 1-5.
These chapters cover at length each layer of the Open Systems Interconnection Reference Model (OSI model, for short) and set the stage by introducing you to the idea of an information-driven society that uses data communications networks to accomplish many goals and objectives.
The link to the Redshelf book is located in your course in the Getting Started module and the Bookshelf link on your top navigation bar.
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