What are differences between the latest authentication collection solution on the simplified campus network and the previous controlled access authentication solution?

What are differences between the latest authentication collection solution on the simplified campus network and the previous controlled access authentication solution?

The previous controlled access authentication solution uses access devices as the NASs. Network administrator has to configure authentication on all layer and all access device. The configuration, management, and maintenance workload is huge. In the simplified campus network solution, the NAS authentication devices are centralized performed on the core switch. The management and maintenance are only performed on the core layer, to achieve controlled authentication. Therefore, the subsequent management and maintenance work is relative simple.