The Catalyst 2950 switches are a family of Ethernet switches that end-user can use to connect workstations and other network devices, such as servers, routers, and other switches. All models of the switch are cluster-capable, but only some models are stackable. end-user can use switches with gigabit interface converter (GBIC) module slots to create switch stacks by using Gigastack GBICs. Some switch models can be deployed as backbone switches, aggregating 10BASE-T, 100BASE-TX, Gigabit Ethernet, and Long-Reach Ethernet (LRE) traffic from other switches and network devices. See the switch software configuration guide for examples that show how end-user might deploy the switches in end-userr network.