The 2900XL series is a set of switch models meant for wiring closets that reached End of Sale (EoS) and End of Life (EoL) in the 2001 to 2004 timeframe. As with most switches series, the different models had different numbers of physical ports or interfaces. With this series, and unlike the newer 2950 and 2960 series, the product number changes based on the number of ports. For example, a 12-port model might be called a 2912 for short. The full product name might be WS-C2912-XL-EN, which is a model with 12 10/100 ports, and Enterprise software.
Most importantly for us, these were some of the first access switches (over time) that were more IOS-like. They were mostly similar to router IOS CLI, follow the same navigation into and out of config mode, stored the configuration with mostly the same rules, used the same help features, and so on. They were much closer to "normal" router IOS, at least compared to 1900s. So, as tools for exam prep, they are a good fit.
As for software, the only thing to watch is to make sure and get a model with Enterprise Edition software; these models end with "-EN" in the formal model numbers. That's typically not a problem in the used market. You can double check the product numbers from this document:
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