Internet addressing and architecture the domain name

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Unformatted text preview: .21 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global 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 6.22 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet The Domain Name System Figure 6-8 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. 6.23 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet Internet Network Architecture Figure 6-9 The Internet backbone connects to regional networks, which in turn provide access to Internet service providers, large firms, and government institutions. Network access points (NAPs) and metropolitan area exchanges (MAEs) are hubs where the backbone intersects regional and local networks and where backbone owners connect with one another. 6.24 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet Internet Services • E-mail • Chatting and instant messaging • Newsgroups • Telnet • File Transfer Protocol (FTP) • World Wide Web • VoIP • Virtual private network (VPN) 6.25 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet Client/Server Computing on the Internet Figure 6-10 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. 6.26 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet How Voice over IP Works An VoIP phone call digitizes and breaks up a voice message into data packets that may travel along different routes before being reassembled at the final destination. A processor nearest the call’s destination, called a gateway, arranges the packets in the proper order and directs them to the telephone number of the receiver or the IP address of the receiving computer. Figure 6-11 6.27 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Global Internet A Virtual Private Network Using the Internet This VPN is a private network of computers linked using a secure “tunnel” connection over the Internet. It protects data transmitted over the public Internet by encoding the data and “wrapping” them within the Internet Protocol (IP). By adding a wrapper around a network message to hide its content, organizations can create a private connection that travels through the public Internet. Figure 6-12 6.28 Essentials of Business Info...
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This document was uploaded on 02/11/2014.

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