system administrator vs network administrator: Network and system administrator titles are often used interchangeably, especially in organizations with small IT teams. However, if you talk to someone from larger organizations, you will soon see clear differences between the two roles. In fact, as the size of the infrastructure and the complexity of IT increase, their functions may become more divided and more specialized.

There are clear indicators to distinguish this role from others - and some different certification pathways to pursuing a career in these roles.
Administrative roles
If you work for a small business in IT, you need to know everything. When you're up and running, set up your physical hardware - servers, desktops, and printers. They are also involved in configuring switches and routers on the local network, pulling the cable, and connecting local devices to the network.

More Info: https://techsiteengineerss.blogspot.com/2020/06/system-engineer-vs-system-administrator.html