Summary ( Chapter 2 )

Summary
In this chapter, you learned about the OSI model and had an introduction to a few of the most popular protocols in use today. You also learned about the seven layers that make up the OSI
model, which are (from top to bottom) the Application, Presentation, Session, Transport, Network, Data Link, and Physical layers. In addition, you learned what each layer’s primary responsibility is and in what layer certain popular protocols function. This chapter also reiterated at which layers certain common devices operate. This chapter included discussions of some of the major protocol suites, including TCP/IP, IPX/SPX, NetBEUI/NetBIOS, and AppleTalk, and how the different protocols of each suite work together. For each protocol, you learned which parts of the protocol stack handle the concepts of addressing, routing, interoperability, and naming. Also in this chapter, you were introduced to popular Data Link technologies, including those
in the 802 standards track of IEEE, such as Ethernet and Token Ring, as well as their media access methodologies, such as CSMA/CD and token passing. On a related note, you were given

the details of the structure and use of the 48-bit MAC address.