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baL76795_pluginb05 - Conrming Pages PLUG-IN B5 Networks and...

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Confirming Pages B5.2 * Plug-In B5 Networks and Telecommunications B5 Networks and Telecommunications Change is everywhere in the information technology domain, but nowhere is change more evident and more dramatic than in the realm of telecommunications and networking. Most information systems today rely on digital networks to com- municate information in the form of data, graphics, video, and voice. Companies large and small from all over the world use networked systems and the Internet to locate suppliers and buyers, to negotiate contracts with them, and to provide bigger, better, and faster services than ever before. Telecommunication systems enable the transmission of data over public or private networks. A network is a communications, data exchange, and resource- sharing system created by linking two or more computers and establishing stan- dards, or protocols, so that they can work together. Telecommunication systems and networks are traditionally complicated and historically inefficient. However, businesses can benefit from today’s modern network infrastructures that provide reliable global reach to employees and customers. Businesses around the world are moving to network infrastructure solutions that allow greater choice in how they go to market—solutions with global reach. Plug-In B5 takes a detailed look at key network and telecommunication technologies being integrated into businesses around the world. P L U G - I N Networks and Telecommunications LEARNING OUTCOMES 1. Compare LANs, WANs, and MANs. 2. List and describe the four components that differentiate networks. 3. Compare the two types of network architectures. 4. Explain topology and the different types found in networks. 5. Describe TCP/IP along with its primary purpose. 6. Identify the different media types found in networks. 7. Describe the business benefits associated with VoIP. 8. Explain the difference between a VPN and a VAN. 9. Identify the advantages and disadvantages of broadband technology. 10. List and describe many of the network security problems. baL76795_pluginb05_002-021.indd 2 baL76795_pluginb05_002-021.indd 2 7/25/09 5:05:23 PM 7/25/09 5:05:23 PM
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Confirming Pages * Plug-In B5 Networks and Telecommunications * B5.3 Network Basics Networks range from small two-computer networks to the biggest network of all, the Internet. A network provides two principal benefits: the ability to communicate and the ability to share. Music is the hot product line at coffee retailer Starbucks. In Starbucks stores, customers can shop for music wirelessly through iTunes free, thanks to the company’s own increasingly sophisticated in-store network. Today’s corporate digital networks include a combination of local area networks and the Internet. A local area network (LAN) is designed to connect a group of com- puters in close proximity to each other such as in an office building, a school, or a home. A LAN is useful for sharing resources like files, printers, games, or other appli- cations. A LAN in turn often connects to other LANs, and to the Internet or wide area networks. A
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