For a corporate environment with VLAN support and 24 Gigabit PoE ports, I would recommend the Cisco Catalyst 2960X-24PS-L switch. This switch offers advanced security features, quality of service (QoS) prioritization, and efficient power management, making it an ideal choice for businesses of all sizes.
In terms of an access switch, the Cisco Catalyst 2960-L series would be a good option. This series offers a range of models to fit different needs, including models with PoE+ capabilities. It also includes advanced security features and flexible management options, making it a reliable and scalable solution for businesses.