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 NumberDomain/Objective DescriptionSection Where Objective Is Covered
1.0Network Architecture
1.1Explain the functions and applications of various network devices5-3, 5-4
1.3Install and configure the following networking services/applications5-4
1.4Explain the characteristics and benefits of various WAN technologies5-4
1.7Differentiate between network infrastructure implementations5-2
1.8Given a scenario, implement and configure the appropriate addressing schema5-2, 5-3
1.9Explain the basics of routing concepts and protocols5-3, 5-5
2.0Network Operations
2.6Given a scenario, configure a switch using proper features5-4
4.2Given a scenario, analyze and interpret the output of troubleshooting tools5-3
4.6Given a scenario, troubleshoot and resolve common network issues5-5
5.0Industry standards, practices, and network theory
5.2Explain the basics of network theory and concepts5-2, 5-4, 5-6

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