Switches are key building blocks for any network. They connect multiple devices, such as computers, wireless access points, printers, and servers; on the same network within a building or campus. A switch enables connected devices to share information and talk to each other.
Catalyst is the brand for a variety of network switches, wireless controllers and wireless access points sold by Cisco Systems. While commonly associated with Ethernet switches, a number of different network interfaces have been available throughout the history of the brand.