I have been using the newest line of Cisco switches, the 9300 series, for two or three years.
We have two different models for deployment. One is the SDN deployment model, which has to do with Software-Defined Networking and is the more recent.
The other is the traditional three-tier, via core access aggregation layer five switches with an Independent Architecture Designed environment or access layer switches where you just use them to connect users to a specific service. It depends on what the nature of the work would be and the scope of work. But generally, most traditional networks have three layers. You have switches in a core of the network, switches in the distribution or aggregation layer, or switches in the access layer. This is the Three-tier module. If it is a collapsed core then it would be just simply the core and the access.
A primary use case is you could use it to connect mostly end-users and host systems. Systems could be servers, systems could be printers, systems could be telephones, and systems could be video conferencing equipment. That's one end use of it.
Another is the use in the data center. Ethernet Switches can be used in a data center out to provide connectivity, wired connectivity for servers, database systems, platforms, other platforms systems, and storage systems. With Ethernet you could have different speeds, so you can have Ethernet running at 1Gig, you can have Ethernet at 10Gig, you can have Ethernet at 40Gig, and you have Ethernet at 100Gig. So, depending on the nature of connectivity, you have that in the data center, you can have that also in an office environment. Then you go up to have it in industrial space, monitoring of industrial machines and control systems. So again, Ethernet is widely used.