I've been offered 4 pieces of equipment by a colleague to use for my lab.
2 x 2621
2 x 2950 (1 x 24, 1 x 4

He thinks the IOS versions on this equipment is 12.1. If I bought this kit off of him would I be able to upgrade to 12.3 or 12.4? Would I have to pay for the upgrade and how would I go about it?
And is this equipment suitable for a CCNA lab?
Cheers
Charlie.