Network enumeration with nmap - host down

Hi, in the module “netword enumeration with nmap”, in the question “Based on the last result, find out which operating system it belongs to. Submit the name of the operating system as result” does not tell me which host to connect to. The machine in the examples says it’s down. I scan the entire range and all the hosts are down. I am connecting through the cloud, so I understand that I do not have to open vpn. Can someone help me please?