Yes, you can use a switch and router from the same brand.
Yes, you can use a switch and router from the same brand.
The FS S3900 works well, but keep in mind it’s a layer 2 device with minimal L3 capabilities. This means it likely won’t function as a DHCP server.
He cannot rely solely on that switch; it wouldn't be sufficient compared to something like an L3 switch.
It varies based on the complexity of tasks and the L3 switch model you have. There are switches that handle most functions like firewalling, DHCP, and routing. The only gap might be VPN support.
I doubt I'll ever encounter them, though maybe lower costs will appear for switches with this capability.