Some Command Prompt Commands: ipconfig, ipconfig /all, ping, net, tracert, nslookup

ipconfig - information about your network configuration
ipconfig /all - detailed information about your network configuration
ping - know if a DNS server is up on your network (internet) and if you are able to comunicate with that DNS server
net - specific for windows networking
tracert - presents the routers between you and a website
nslookup - presents the ip addresses of a website