Résumé : Computer networking is an exciting and fascinating field of study. It is the fastest growing technology in our society. A computer network is a connection of two or more autonomous computers and other devices so that they can communicate and share information. It enables sharing of files, data, and devices such as printers. It facilitates interpersonal communications and allows users to communicate via various means: email, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing. Computer networking relies on the related discipline of electrical engineering, computer engineering, and computer science. Earlier, computer networks consisted of mainframes in a building. Computers became more powerful, smaller, and less expensive, to the point that the typical desktop PC is equivalent to an early mainframe. This led to the need to network those devices within the workplace to form a local area network (LAN) that will allow PC users to share access to hosts, databases, printers, etc.