Managed switches give you greater security and more features and flexibility because you can configure them to precisely match your network requirements. With this greater control, you can better protect your network and improve the quality of service for those who access the network. Cisco Business 350 Series is a family of managed switches.
Smart switches offer some management, quality of service, and security capabilities, so they can be a cost-effective alternative to managed switches. However, they are not as scalable as managed switches and are typically deployed at the edge of a large network, as the infrastructure for smaller networks, or for low complexity networks. Cisco Business 250 Series and Cisco Business 220 Series are families of smart switches.
An unmanaged network switch is designed so that you can simply plug them in and they work, no configuration required. Unmanaged switches are typically for basic connectivity. You’ll often see them used in home networks or wherever a few more ports are needed, such as at your desk, in a lab, or in a conference room. Cisco Business 110 Series is a family of unmanaged switches.