What defines a private, internal network using Internet tools and protocols?

A private internal network that utilizes Internet tools and protocols is defined as an intranet. An intranet operates on similar technologies as the Internet, such as TCP/IP protocols, but is confined to an organization or a specific group. It serves as a secure and restricted environment that allows members to communicate, share information, and collaborate within the confines of that organization without exposing that information to the outside world.

Intranets typically include web applications, shared file storage, and internal communication platforms, all tailored to enhance productivity and information flow among employees. The inherent security and controlled access features distinguish an intranet from other types of networks, ensuring that sensitive data remains protected and accessible only to authorized users.

Other types of networks mentioned don’t align with this definition in the same way. For instance, an extranet extends a limited component of an intranet to users outside the organization, a Virtual Private Network (VPN) allows secure connections over the Internet but does not define the internal structure itself, and a Local Area Network (LAN) describes a specific geographic area of connectivity rather than the use of Internet protocols and tools on a larger scale.