Theory -64:- Explain Internet , Intranet and Extra net with Their Comparison

 

The Internet, Intranet, and Extra net are the most popular platforms for e-commerce. In Internet is the most common platform for B2C e-commerce; the intranet is most the common for platform for corporate internal management; and the extra net is the most common platform for B2B e-commerce.

 

The Internet .

The Internet is a public and global communication network that provides direct connectivity to anyone over a local area network (LAN) or Internet Service Provider (ISP). 2. The Internet is a public network that is connected and routed over gateways. End users are connected to local access providers (LANs or ISPs), who are connected to the Internet access providers, to network access providers, and eventually to the Internet backbone. 3. Since access to the Internet is open to all, there is a lack of control that may result in an unruly proliferation of information.

 

The Intranet:.

An intranet is a corporate LAN or wide area network (WAN) that uses Internet technology and is secured behind company’s firewalls (see security and protection). 2. The intranet links various servers, clients, databases, and application programs like Enterprise Resource Planning (ERP). Although intranets are developed on the same TCP/IP protocol as the Internet, they operate as a private network with limited access. 3. Only authorized employees are able to use it. Intranets are limited to information pertinent to the company and contain exclusive and often proprietary and sensitive information. 2 4. The firewalls protect the intranets from unauthorized outside access; the intranet can be used to enhance the communications and collaboration among authorized employees, customers, suppliers, and other business partners. 5. Since the intranet allows access through the Internet, it does not require any additional implementation of leased networks. This open and flexible connectivity is a major capability and advantage of intranet. Intranets provide the infrastructure for many intrabusiness commerce applications.

 

The Extranet . 

An extranet, or “extended intranet”, uses the TCP/IP protocol network of the Internet, to link intranets in different locations. 2. Extranet transmission is usually conducted over the Internet, which offers little privacy or transmission security. 3. Therefore, when using an extranet, it is necessary to improve the security of connecting portions of he Internet. This can be done by creating tunnels (see paragraph on security and protection) of secured data flows, using cryptography and authorization algorithm. 4. The Internet with tunneling technology is known as a virtually private network (VPN). 5. Extranets provide secured connectivity between corporation’s intranets and the intranets of its business partners, material suppliers, financial services, government, and customers. 6. Access to intranets is usually limited by agreements of the collaborating parties, is strictly controlled, and is only available to authorized personnel. 7. The protected environment of the extranet allows groups to collaborate, sharing information exclusively, and exchanging it securely. 8. Since an extranet allows connectivity between businesses through the Internet, it is an open and flexible platform suitable for supply chain management. 9. To increase security, many companies replicate the database they are willing to share with their business partners and separate them physically from their regular intranets.