Internet:
- Definition: The Internet is a global network of interconnected computers and networks that use the Internet Protocol Suite (TCP/IP) to communicate and share resources.
- Scope: It is a public network that connects millions of devices worldwide, allowing users to access a vast array of information, services, and resources.
- Access: Users connect to the Internet through Internet Service Providers (ISPs) via various means such as dial-up, DSL, cable, fiber-optic, or wireless technologies.
- Purpose: The Internet is used for various purposes, including communication, information sharing, online browsing, e-commerce, social networking, entertainment, and more.
Extranet:
- Definition: An Extranet is a private network that uses the Internet Protocol Suite (TCP/IP) to securely share information, resources, and services with external users, such as customers, partners, suppliers, and other stakeholders.
- Scope: It is an extension of an organization’s internal network and is designed to facilitate collaboration and communication between the organization and its external partners.
- Access: Access to an Extranet is restricted and controlled through authentication mechanisms such as usernames, passwords, and encryption to ensure security and confidentiality.
- Purpose: Extranets are used for various purposes, including sharing documents and files, conducting business transactions, collaboration on projects, providing customer support, and managing relationships with external partners.
Ethernet:
- Definition: Ethernet is a widely used networking technology that defines standards for the physical and data link layers of the OSI model. It is used for connecting devices within a local area network (LAN) or metropolitan area network (MAN) using wired connections.
- Scope: Ethernet is a networking standard that specifies the hardware (e.g., cables, connectors, switches, routers) and protocols (e.g., Ethernet frames) used for transmitting data packets between devices on a network.
- Access: Ethernet networks use various types of cables (e.g., twisted-pair, fiber-optic) and Ethernet switches to connect devices and enable communication within a network.
- Purpose: Ethernet is used for creating local networks within organizations, campuses, buildings, and homes to facilitate communication, resource sharing, and connectivity between computers, servers, printers, and other networked devices.
 the Internet is a global network that connects devices worldwide, the Extranet is a private network for sharing information with external users, and Ethernet is a networking standard for connecting devices within a local or metropolitan area network using wired connections.