Unit ContentsUnit 1: Computers and Software in NetworksThis unit takes a look at the devices a network typically connects. We discuss the basic concepts of how computers work and will introduce the main components and features of computer systems. Lessons
Unit 2: Carrier Signals, Cable Types, and Network TopologiesIn this unit, we consider the physical qualities of the network itself. We explore the nature of electronic communication and explain how information can be transmitted as analog or digital signals. We explain the various physical layouts or topologies of data networks and describe the characteristics of the three main types of physical transmission media used in networks. Lessons
Unit 3: Computer Protocols and ServicesThis unit introduces basic terms and concepts which define all computer communication protocols. You will learn how protocols work, and how different protocols work together to move data across a network. Lessons
Unit 4: The OSI ModelThis unit introduces the Open Systems Interconnection (OSI) model. In order for data communication to exist, computers and programs must use a common protocol to communicate. The OSI model provides a conceptual structure that helps us discuss and compare network functions. Lessons
Unit 5: LANsIn this unit we will use concepts presented in earlier units to explain the specific technologies and protocols used in most local area networks (LANs). Specifically, this unit will teach you about the popular LAN protocols of Ethernet and Token Ring, and the increasingly important technology of wireless networking. Lessons
Unit 6: Network ComponentsThis unit takes a look at internetworking devices, such as repeaters, hubs, switches, bridges, routers, and gateways. These function together to manage data traffic as it flows within and between networks. Together they increase the effective transmission capacity of a network and enhance its security. Lessons
Unit 7: WANsThis unit introduces the technologies used to connect two or more local area networks (LANs) over an extended distance. This unit also will look at the two main classes of technologies used for WAN connectivity: point-to-point services and switched services. We will also describe the devices needed to implement each type of service. Lessons
Unit 8: Integrating the Course ElementsThis unit reviews the major concepts presented in this course, and shows how they work together in several real-world situations. You will see how the processes, protocols, and networking devices work together to move information between two computer applications. Lessons
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