The hotel network is limited, but you can surf the Internet by manually setting IP.

if you can't get the address, but the manual configuration can get through, check the problem from the router, look at the network separately, and take a notebook to check it layer by layer.

check the router configuration first. If it's normal, take a notebook to the router and try again. If it's normal, try again at the lower port of the router, and then try again at the lower port of the switch, so as to isolate the problem to an area, find the problem under a certain port, and then find the problem at this port.

if this port works, but it doesn't work down, look for the reason of the network cable.

don't have too much confidence in the connection quality of the network cable. This will happen to some network cables with poor quality. Make the crystal head again.

it's better to tell the model of your router and switch and how to connect them, so as to help you judge better.

I hope my answer will help you.