Figure

The DoD model

Application

Transport

Network

Link

The DoD model is so named because it was a TCP/IP four-layer protocol originally developed by the United States Department of Defense when defining TCP/IP. The seven layers of the OSI network model have a many-to-one mapping to the four layers used in the DoD model.

r ; i- , For additional information about the OSI and DoD networking models and i-.-.,". .■¿•CV-.w the relationships between the various layers that they define, see sites such as www.comptechdoc.org/independent/networking/guide/netstandards.html and www.novell.com/info/primer/prim05.html.

So there you have it, a TCP/IP conceptual overview. The information will become clearer as we progress through the chapter.

i: A wealth of good books about TCP/IP are available, as well as a plethora of Internet ~ ■ resources. This chapter provides an overview of networking theory to make it easier to understand how Linux uses networks and what aspects of networking you may need to configure. This is not a networking book, so we've provided only as much detail as necessary for basic understanding.

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