Internet is a computer network which connects all kinds of devices: computers, telephones, cameras, cars, planes, etc ... All are connected to each other by a network by which we must distinguish 3 entities:


  1. Connected devices located at the edges of the network. They are the hosts.
  2. The internal nodes of the networks: wifi terminals, 4G antennas, routers, etc...
  3. The links that there are between these different nodes: cables, optical fiber, air for electromagnetic waves. All the internet network is divided into ISP (Internet Servive Provider): these are the internet service providers (ISP): Free, Orange, etc ... all these ISPs are linked together at the international level to ensure global communication .





Hosts exchange information through the network but to communicate with each other they must have a communication protocol.