What is network ?

A computer network is a collection of PCs and other devices connected together with cables, so that they can communicate with each other for the purpose of sharing information and resources. Networks vary in size: some are within a single office, others span the globe.

There are various network technologies, the most common being Ethernet and Fast Ethernet. A network can be made up of one or more of these technologies. Ethernet and Fast Ethernet networks operate in a similar way, the main difference is the speed at which they transfer information; Ethernet operating at 10 Megabits per second (Mbps) and Fast Ethernet operating at 100 Megabits per second (Mbps)