Chapter 8: Outlining the OSI Model

Effective packet analysis begins with a solid understanding of the Open Systems Interconnection (OSI) model. The OSI model is a seven-layer framework that outlines how the operating system (OS) transforms, encapsulates, and prepares data for transport on the network. In this chapter, we'll cover the seven layers and the role and purpose of each layer. Additionally, you'll learn how within the OSI model, there are three layers that use a specific address or identifier. The Transport layer has an associated port, The Network layer uses an Internet Protocol (IP) address, and the Data Link layer requires a Media Access Control (MAC) address. So that you are able to differentiate identifiers for each of the layers, we'll review and describe the significance of each one.

Then, we'll take a look at the Protocol Data Unit (PDU) for each layer.

Once done, you will be more familiar with the terminology and have a better understanding...