What are Intranet and Extranet? What is the difference?

Intranet: local area network. Usually refers to the internal network of enterprises or schools, factories, communities and so on. Of course, if two computers in your own home are connected together, it is also an intranet. The scope of a local area network usually does not exceed one city. Except for the intranet of senior state organs such as police, military and civil aviation. Their common feature is that only some machines can communicate with the outside world, while internal machines cannot communicate with the outside world. However, this kind of network basically does not exist at present, except for the police, the army and other high-level security. Because even factories and schools have long been able to connect all the computers on the network to the Internet through the server. Intranet is routed out. Usually 192+068. . . At the beginning.

Extranet: Internet. Netcom, Telecom, Tietong, etc. It is beyond the coverage of LAN, so it should be regarded as an external network. The key to judge whether the external network and the internal network are interconnected with the broad outside world. This is what we call the concept of www, the World Wide Web. This is a global interconnection. No matter what broadband you use, as long as you are connected to the Internet, you can communicate with the outside world (globally). This is the extranet.