电子商务：管理视角chap07

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Generic Functions of an Intranet
Corporate/department/individual Web-pages Database access: Web-based databases Search engines and directory: Assist key word-based search Interactive communication: Chatting, audio and videoconferencing Document distribution and workflow: Web-based download and
routing of documents
Groupware: Enhanced e-mail and a bulletin board Telephony: Intranets are the perfect conduit for computer-based
telephony
Integration with electronic commerce: Interface with Internetbased electronic sales and purchasing
Web servers
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ִAn extranet implies an “extended intranet”, which uses TCP/IP protocol networks (like the Internet) to link intranets in different locations. Extranet transmissions are conducted over the Internet to save money. But it offers no privacy or transmission security. By creating tunnels of secure data flows using cryptography and authorization algorithms, called VPNs, the security can be improved. ִExtranets provide secure connectivity between a corporation’s intranets and intranets of its business partners, material suppliers, financial services, and customers.
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The Internet
ִThe Internet is a public and global communication network that provides direct connectivity to anyone via a Local Area Network (LAN) and an Internet Service provider (ISP). Access to the Internet is not restricted to anyone. This lack of control may result in an information overload. Due to its vast scope and openness, the information is difficult to locate. Users need effective and efficient search engines to navigate the sea of information . There is no centralized control of network and information.
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Intranet
Extranet
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Firewalls
Definition of Firewall
ִSoftware and hardware that allows only those external users with specific characteristics to access a protected network ִProvides potential customers with secured account, credit card, and loan information ִUsually located at a gateway point and controls traffic between internal and external networks
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Automotive Network Exchange the Largest Extranet (cont.)
Chrysler will pay for fewer T1 Lines and satellite connections Standardizing one protocol-IP will reduce support costs The time it takes to turn around an order will be much shorter The faster the parts come in, the faster the cars leave the assembly line, the larger the customer satisfaction and manufacturer’s profit Business-to-business virtual private networks (VPN) are used © Prentice Hall, 2000
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The Intranet (cont.)
Servers Clients Legacy systems Public/External Internet Users Intranet E-mail servers ERP
Firewalls Databases
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The Extranet (cont.)
Extranet
Suppliers
VPN Intranet
Firewall
Distributors
VPN
Tunneling Internet
Intranet
VPN
Customers
Firewall
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Learning Objectives (cont.)
Identify the key element of extranets Identify the key technologies for tunneling Discuss the applications of extranets Describe typical industries that use extranets Discuss the business models for extranet applications Describe the concept of embedded extranets
Chapter 7 The Intranets and Extranets
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Learning Objectives
Describe the relationship among the Internet, an intranet and an extranet Discuss the role of firewalls for intranets and extranets Discuss the functions of intranets Discuss the applications of intranets Describe the industries that use intranets Discover typical cases of intranet applications
Extranet: Link geographically dispersed branches, customers and
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Automotive Network Exchange the Largest Extranet
Companies in the automotive market swap supply and manufacturing data Involve 10,000+ companies Include CAD/CAM file transfers, Electronic Data Interchange (EDI), e-mail, and groupware The network’s EDI element alone will slice $71 from the cost of designing and building each car Savings of $1 billion a year for the Industry
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Summary : Internet, Intranet, and Extranet
Network Type Internet Typical Users Any individual with dial-up access or LAN Authorized employees ONLY Authorized groups from collaborating companies Type of Access Unlimited, public; no restrictions Private and restricted Private and outside authorized partners Information General, public and advertisement Specific, corporate and proprietary Shared in authorized collaborating group