WAN Technologies and the OSI Model


By Dan DiNicolo, January 8th, 2007 Posted in CCNA Study Guide Chapter 11. Subscribe to our RSS Feed



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WAN technologies are considered to exist and function at the three lower layers of the OSI model – Physical, Data Link, and Network. While not all WAN technologies have elements that function at the Network Layer, some (like X.25 and ISDN) do. The figure below provides an overview of how the WAN technologies that you’ll look at in this chapter map to the OSI model.

Figure: A high-level overview of how various WAN technologies map to the Physical, Data Link, and Network layers of the OSI model.

Written by Dan DiNicolo - Visit Website

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