The Modern Method (GNS3 Appliances): Instead of manually configuring every setting, GNS3 uses "Appliances."
To emulate a Cisco Catalyst 2960 switch in GNS3 you typically use one of these approaches: cisco 2960 switch ios download for gns3
If your search for "cisco 2960 switch ios download for gns3" fails, consider these alternatives. The Modern Method (GNS3 Appliances): Instead of manually