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

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

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

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

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