Chapter 6 Telecommunications,Telecommunications, thethe Internet,Internet, andand WirelessWireless TechnologyTechnology 6.1 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology STUDENT OBJECTIVES • Describe the features of telecommunications networks and identify key networking technologies. • Evaluate alternative transmission media, types of networks, and network services. • Demonstrate how the Internet and Internet technology work and how they support communication and e-business. 6.2 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology STUDENT OBJECTIVES (Continued) • Identify and describe the principal technologies and standards for wireless networking, communication, and Internet access. • Assess the business value of wireless technology and important wireless applications in business. 6.3 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Dartmouth: An Old College Becomes a New Networking Innovator • Problem: High networking costs, maintaining a high- quality learning environment while embracing new technology and the opportunities it provides. • Solutions: Deploy IP and Wi-Fi networks to combine voice, data, and video on a single backbone, establishing campus-wide mobile access and high- speed data and voice services. • Replacing the outdated separate networks reduced costs and increased the services available. • Demonstrates IT’s role in delivering information services that enhance a learning environment. • Illustrates digital technology’s role in creating new opportunities. 6.4 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Dartmouth: An Old College Becomes a New Networking Innovator Interactive Session: Dartmouth College • Think about the networking infrastructure of your campus • If your campus has a wireless network, what benefits does the network provide to the students, faculty, and staff? • If your campus does not have wireless access, what benefits do you imagine such a network would provide? • What problems do you think might come along with deploying a wireless network on a college campus? 6.5 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Telecommunications and Networking in Today’s Business World Networking and Communication Trends • Telephone networks vs. computer networks • Single, digital networks and Internet-based standards • Telecommunications providers • Broadband 6.6 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Telecommunications and Networking in Today’s Business World What Is a Computer Network? • Two or more connected computers • Network interface card (NIC) • Network operating system (NOS) • Hubs, switches, and routers • Corporate-wide networks 6.7 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Telecommunications and Networking in Today’s Business World Components of a Simple Computer Network Illustrated here is a very simple computer network, consisting of computers, a network operating system residing on a dedicated server computer, cabling (wiring) connecting the devices, network interface cards (NIC), switches, and a router. Figure 6-1 6.8 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Telecommunications and Networking in Today’s Business World Key Digital Networking Technologies • Client/server computing • Packet switching • TCP/IP and connectivity • Protocols govern transmission of information between two points • Worldwide standard is TCP/IP • Four-layered Department of Defense reference model for TCP/IP includes application layer, transport layer, Internet layer, and network interface layer 6.9 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Telecommunications and Networking in Today’s Business World The Transmission Control Protocol/Internet Protocol (TCP/IP) Reference Model This figure illustrates the four layers of the TCP/IP reference model for communications. Figure 6-4 6.10 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Communications Networks Physical Transmission Media • Twisted wire (modems) • Coaxial cable • Fiber optics and optical networks • Dense wavelength division multiplexing (DWDM) • Wireless transmission media and devices • Microwave • Satellites • Cellular telephones • Transmission speed (hertz, bandwidth) 6.11 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Communications Networks Types of Networks • Local-area networks (LANs) • Campus-area networks (CANs) • Peer-to-peer • Topologies: star, bus, ring • Metropolitan and wide-area networks • Wide-area networks (WANs) • Metropolitan-area networks (MANs) 6.12 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology Communications Networks Broadband Network Services and Technologies • Frame relay • Asynchronous Transfer Mode (ATM) • Integrated Services Digital Network (ISDN) • Digital subscriber line (DSL) • Cable Internet connections • T lines 6.13 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet • What is the Internet? • Internet Addressing and Architecture • The Domain Name System • Hierarchical structure • Top-level domains • Internet Architecture and Governance • No formal management: IAB, ICANN, W3C • The Future Internet: IPv6 and Internet2 6.14 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet The Domain Name System The Domain Name System is a hierarchical system with a root domain, top-level domains, second-level domains, and host computers at the third level. Figure 6-8 6.15 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Internet Services • E-mail • Usenet newsgroups • LISTSERVs • Chatting and instant messaging • File Transfer Protocol (FTP) • World Wide Web 6.16 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Interactive Session: Internet Services • Name specific examples of each of the Internet services that were mentioned previously • Discuss ways in which each of these services may be used to the benefit of a business • Located Web pages that illustrate each of these services in the context of business use 6.17 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Client/Server Computing on the Internet Client computers running Web browser and other software can access an array of services on servers over the Internet. These services may all run on a single server or on multiple specialized servers. Figure 6-10 6.18 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet The World Wide Web • Hypertext • Hypertext Transfer Protocol (HTTP) • Uniform resource locators (URLs) • Web servers • Searching for information on the Web • Search engines • Intelligent agent shopping bots • RSS 6.19 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Intranets and Extranets • Intranets • Use existing network infrastructure with Internet connectivity standards software developed for the Web • Create networked applications that can run on many types of computers • Protected by firewalls • Extranets • Allow authorized vendors and customers access to an internal intranet • Used for collaboration • Also subject to firewall protection 6.20 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Technologies and Tools for Communication and E-Business • E-mail, chat, instant messaging, and electronic discussions • Groupware and electronic conferencing • Internet telephony • Virtual private networks 6.21 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The Internet Monitoring Employees on Networks: Unethical or Good Business? • Read the Focus on People and then discuss the following questions: • What problems arise from giving employees access to e-mail and the Internet during working hours? • Should managers monitor employee e-mail and Internet usage? • Why or why not? • Describe an effective e-mail and Web use policy for a company. 6.22 © 2007 by Prentice Hall Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Wireless Technology The