What's the difference between Internet and LAN?

1. The Internet is the Internet and a collection of computer networks. It connects computer networks all over the world (local area network, metropolitan area network and wide area network with public IP address) through TCP/IP protocol and routers to form the Internet.

Computer network is a collection of computers, which can be divided into local area, metropolitan area and wide area according to its span.

Third, when routers are interconnected, they are addressed according to the network address in the IP address, rather than the host address of a specific machine, just as the post office is only responsible for sending letters to the corresponding units instead of someone.

4. There is no network address in local area, metropolitan area and wide area. They all look for targets only according to the network card address of each machine, so they are all collections of computers. So the Internet is the Internet, neither a wide area network, nor a metropolitan area network, nor a local area network.

Extended data:

1. Internet (English: Internet) belongs to the field of media, also known as the international network. It is a huge network connected in series between networks, which are connected by a common protocol to logically form a single huge international network.

The general Internet refers to the general Internet, and the Internet refers to the special Internet. This method of connecting computer networks together can be called "network interconnection", and on this basis, the global internet covering the whole world is developed, which is called Internet, that is, the interconnected network structure.

Second, the local area network is a closed computer group consisting of more than two computer network cables and other network equipment in a fixed geographical area. Within a few kilometers, there must be a unique IP address on the network, which is unique. In another LAN, you can still use this IP address.

3.WAN is a collection of networks with a very large geographical span, ranging from tens of kilometers to thousands of kilometers. Every computer (or other network device) on the WAN has one or more WAN IP addresses, which cannot be duplicated.

Baidu Encyclopedia-Internet