What Does A Network Switch Do?

A network switch is a networking device that connects multiple IT devices (using RJ45 cables) on a network to other networked devices and resources. The use of network switches allows for connectivity and the sharing of data and resources with other users and devices on the network. Some network devices allow for port connections to be managed and controlled using a built-in software interface.
Whilst an internet router may have one or more built-in Ethernet ports, a more robust connectivity solution is provided by installing a network switch between the router or a server and other devices on the network. Sizing network switches is therefore based on the number of ports required and the bandwidth, capacity and data transmission speeds required. Port numbers can range from single digits (small office LAN) to switches with 50 or 100 or more ports (server rooms and data centres).