Chapter 2


The following topics are covered in this chapter:

  • Understanding the Host-to-Host Communications Model
  • Understanding Host-to-Host Communications
  • OSI Reference Model
  • OSI Model Layers and Their Functions
  • Encapsulation and De-Encapsulation
  • Peer-to-Peer Communication
  • TCP/IP Suite

Welcome to the exciting world of internetworking. This chapter will really help you review your understanding of basic internetworking by focusing on how to connect networks using Cisco routers and switches. First, you need to know exactly what an internetwork is, right? You create an internetwork when you connect two or more networks via a router and configure a logical network addressing scheme with a protocol such as IP or IPv6.

I’ll be reviewing the following topics in this chapter:

  • Internetworking basics
  • Network segmentation
  • How bridges, switches, and routers are used to physically and logically segment a network
  • How routers are employed to create an internetwork

I’m also going to dissect the Open Systems Interconnection (OSI) model and describe each part to you in detail because you really need a good grasp of it for the solid foundation upon which you’ll build your Cisco networking knowledge. The OSI model has seven hierarchical layers that were developed to enable different networks to communicate reliably between disparate systems. Because this book is centering upon all things CCNA, it’s crucial for you to understand the OSI model as Cisco sees it, so that’s ...

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