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Networking Essentials: Interconnecting the LANs

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The utility of LANs led to the desire to connect two (or more) networks together. This chapter from Networking Essentials: A CompTIA Network+ N10-006 Textbook, 4th Edition introduces the concepts and issues behind interconnecting LANs.
This chapter is from the book

5-1 Introduction

The framework defining the network layers for linking networks together is defined by the OSI model and was introduced in Chapter 1, “Introduction to Computer Networks,” section 1-3. The OSI model provides a framework for networking that ensures compatibility in the network hardware and software. The concepts behind the hardware technologies used to interconnect LANs are presented in sections 5-2 to 5-5. The properties of a networking bridge are defined in section 5-2. The layer 2 switch is examined in section 5-3, and the router is introduced in section 5-4. An example of interconnecting LANs is provided in section 5-5. The chapter concludes with a section on the concept of auto-negotiation, examining the advantages and disadvantages of this network configuration option.

Table 5-1 lists and identifies, by chapter section, where each of the CompTIA Network+ objectives are presented in this chapter. The chapter sections where each objective is presented are identified. At the end of each chapter section is a review with comments of the Network+ objectives presented in that section. These comments are provided to help reinforce the reader’s understanding of a particular Network+ objective. The chapter review also includes “Test Your Knowledge” questions to aid in the understanding of key concepts before the reader advances to the next section of the chapter. The end of the chapter includes a complete set of question plus sample certification type questions.

TABLE 5-1 Chapter 5 CompTIA Network+ Objectives

Domain/Objective Number

Domain/Objective Description

Section Where Objective Is Covered


Network Architecture


Explain the functions and applications of various network devices

5-3, 5-4


Install and configure the following networking services/applications



Explain the characteristics and benefits of various WAN technologies



Differentiate between network infrastructure implementations



Given a scenario, implement and configure the appropriate addressing schema

5-2, 5-3


Explain the basics of routing concepts and protocols

5-3, 5-5


Network Operations


Given a scenario, configure a switch using proper features





Given a scenario, analyze and interpret the output of troubleshooting tools



Given a scenario, troubleshoot and resolve common network issues



Industry standards, practices, and network theory


Explain the basics of network theory and concepts

5-2, 5-4, 5-6

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