At the Command Prompt window, type ipconfig then press Enter. You will see a lot of possibly confusing numbers and words, but ...

You can then try connecting your network again and see if the issue ... which can be confirmed by testing the router/modem with another device. It is the former if it works; if it does not ...

Many consumer routers have a USB port for connecting certain devices ... If you want to access a folder on another PC on your network, you can map a network drive on Windows 11.