Legacy models supported a variety of interfaces, such as token ring, FDDI, and 100Base VG, but are no longer sold by Cisco Systems.
Most models have basic layer 2 functions and are capable of switching Ethernet frames between ports.
While commonly associated with Ethernet switches, a number of different network interfaces have been available throughout the history of the brand.
In some cases, particularly in the modular chassis switches, a configuration called 'Hybrid' has emerged - this is where the layer 2 functions are configured using Cat OS, and the layer 3 elements are configured using IOS.
Is there an easy way to recover from this situation if that happens? Aside from the switch checking to make sure the firmware is for that model and any number of boot issues you would have if you could force it to install, the 2960S firmware wouldn't fit on the flash of a 2950. I believe the 2950 has an 8MB flash card while the 2960S firmware is ~13MB. to Gigabit Ethernet on the 2960S) you wouldn't be able to do a direct copy and past.
Can I create config on say 12.4 on the 2950 and just copy/paste into the new switch (2960 running likely 15. You could copy and paste it into notepad or your text editor of choice and do a replace on Fast Ethernet for Gigabit Ethernet and add or remove ports that either did or did not exist on the 2950.
Native IOS can also be found with newer software versions that have eliminated Cat OS entirely in favor of IOS, even on hardware that originally required Cat OS.
Some newer Catalyst switch models (with recent versions of the Cisco IOS) also allow web-based management using a graphical interface (GUI) module which is hosted on a HTTP server located on the switch.
Many Catalysts that run IOS are also capable of functioning as a router, making them layer 3 devices; when coupled with TCP and UDP filtering, these switches are capable of layer 2-4 operation.