Exam Objectives Fast Track

Understanding the Purpose and Function of Networking Models

 The Department of Defense (DoD) model was originally designed to share computer data across a wide area between several large, mainframe computers.

 The DoD’s Advanced Research Projects Agency (DARPA) formed an internetworking experiment called ARPANET.

 The DoD model used four layers: Network Interface, Internet, Host-to-Host, and Application.

 The OSI model is based on the DoD model and has seven defined layers.

 The seven layers of the OSI model are Physical, Data Link, Network, Transport, Session, Presentation, Application.

 An acronym commonly used to remember the seven layers is All People Seem To Need Data Processing.

 Each layer of the OSI model is ...

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