Computer networks allow users to share resources and to communicate. Can you imagine a world without emails, online newspapers, blogs, web sites and the other services offered by the Internet? Networks also allow users to share resources such as printers, applications, files, directories, and storage drives. This chapter provides an overview of network principles, standards, and purposes. IT professionals must be familiar with networking concepts to meet the expectations and needs of customers and network users.
You will learn the basics of network design and how devices on the network impact the flow of data. These devices include hubs, switches, access points, routers, and firewalls. Different Internet connection types such as DSL, cable, cellular and satellite are also covered. You will learn about the four layers of the TCP/IP model and the functions and protocols associated with each layer. You will also learn about many wireless networks and protocols. This includes IEEE 802.11 Wireless LAN protocols, wireless protocols for close proximity, like Frequency Identification (RFID), Near Field Communication (NFC), and smart home protocol standards like Zigbee and Z-wave. This knowledge will help you successfully design, implement, and troubleshoot networks. The chapter concludes with discussions on network cable types; twisted-pair, fiber-optic, and coaxial. You will learn how each type of cable is constructed, how they carry data signals, and appropriate use cases for each.
It is important to not only learn about computer network operation and components but also to build hands-on skills. In this chapter you will build and to test a straight-through Unshielded Twisted-Pair (UTP) Ethernet network cable.