Four computers (with network cards)

router

An 8-port switch

Net line n meter

The operating system NetWare/Unix/Linux/Windows can be used.

Take the Windows operating system as an example.

Network protocol TCP/IP protocol

IP configuration can be automatic or manual (preferably with the same IP segment).

It is better for the working group to set up the same group.

DNS can be obtained automatically or configured manually.

The budget depends on the specific configuration, the computer configuration is high or low, and the router, switch and network cable are only a few dollars. Look at the latest quotation!

The topology diagram is too simple. The router goes online, goes to the switch, and then is assigned to the computer by the switch every day.