Foundation Topics

OSI Layer 3-equivalent protocols use routing and addressing to accomplish their goals. The choices made by the people who made up addressing greatly affect how routing works, so the two topics are best described together.

This chapter begins with an overview of the functions of routing and network layer logical addressing. Following that, the text moves on to the basics of IP addressing, relating IP addressing to the OSI routing and addressing concepts covered in the first section. The chapter ends with an introduction to IP routing protocols.

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