The document discusses the differences between the Internet, intranets, and extranets. The Internet is a public global network with no access restrictions, while an intranet is a private internal network within an organization protected by firewalls. An extranet extends an organization's intranet by allowing controlled access to selected partners and customers through additional firewalls and virtual private networks.

1. Relationship between Intranet and Extranet By: Mohammed Nadeem

2. 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.

3. The Intranets Intranet uses the same Web interface but put up firewalls (a special security software) so that only employees could access the company’s Web site. It is an internal organizational Internet. Only employees who are issued passwords and access codes are able to use them. Firewalls protect intranets from unauthorized outside access.

4. The Intranet (cont.) Public/External Internet Users Intranet Clients Servers ERP Legacy systems E-mail servers Web servers Databases Firewalls

5. Firewalls Software and hardware that allows only those external users with specific characteristics to access a protected network Usually located at a gateway point and controls traffic between internal and external networks

6. Advantages of Intranets Intranets help employees to quickly locate information and applications relevant to their roles and responsibilities. Standard interface, allowing “access from anywhere”. Can serve as a powerful tool for communication within an organization. Permits information to be published.

7. The Extranet An extranet implies an “ extended intranet ”, which uses TCP/IP protocol networks (like the Internet) to link intranets in different locations. Extranet is somewhere between Internet and Intranet. It also uses firewalls , but it allows only selected outsiders, such as business partners, suppliers, and customers, to access the company’s Web site. Can be viewed as part of a company’s Intranet that is extended to users outside the company.

8. The Extranet (cont.) Tunneling Internet Extranet Intranet Firewall Intranet Firewall Suppliers VPN Distributors VPN Customers VPN

9. Virtually Private Network (VPN) VPN is a secure network on the Internet using the tunneling schemes When two sites are connected across a VPN, each must have a VPN-capable router, firewall, or VPN access device installed

10. Advantages of Extranet Can improve organization productivity. Allows information to be viewed at times convenient for external users. Cuts down on meeting times. Information can be updated instantly. Authorized users have immediate access to latest information. Can improve relationships with customers

11. Summary : Internet, Intranet, and Extranet Network Typical Type of Type Users Access Information Internet Any individual with dial-up access or LAN Unlimited, public; no restrictions General, public and advertisement Intranet Authorized employees ONLY Private and restricted Specific, corporate and proprietary Extranet Authorized groups from collaborating companies Private and outside authorized partners Shared in authorized collaborating group

12. Industry Specific Intranet Solutions Financial Services : Banking, brokerages and other financial services, insurance Information Technology Manufacturing : Chemicals and oil, consumer goods, food and beverages, general manufacturing, and pharmaceuticals Retailing Services : Construction and engineering, education, environmental, healthcare, media, entertainment, telecommunications, transportation, and utilities

13. Basic Concept of Extranets Revisited © Prentice Hall, 2000 Enterprise Consumers Suppliers Clients Business Partners Distributors VPN Internet Intranet Extranet Intranet Intranet Intranet Intranet VPN VPN VPN VPN Remote Employees

14. Elements of Extranets Components of Extranets Intranets Web server Firewalls Tunneling technology Interface software Business application

15. Productivity Enhancements Benefits of Extranet Application Just-in-time (JIT) information delivery Reduction of information overload Productive collaboration between workgroups Training on demand

16. Business Enhancements Benefits of Extranet Application Faster time to market Improved client relationships New business opportunities

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