CompTIA Network+ (N10-004) Cert Guide

Chapter 9. OSI Model

This chapter covers CompTIA Network+ objective 4.1. Upon completion of this chapter, you will be able to answer the following questions:

• What is the function of the OSI 7 layer model?

• At which level of the OSI model does common network hardware operate?

• At which level of the OSI model do TCP/IP protocols operate?

One of the most important networking concepts to understand is the Open Systems Interconnection (OSI) reference model. This conceptual model, created by the International Organization for Standardization (ISO) in 1978 and revised in 1984, describes a network architecture that enables data to be passed between computer systems. Even though the OSI model is conceptual, an appreciation of its purpose and function ...