Network command you can use into windows command console.
Flush DNS and Renewing IP.
netsh winsock reset
nslookup (type the name of a website like www.google.be or a hostname) => nslookup www.google.be
Tracert command to an other computer - server.
tracert (type the name of a website like www.google.be or a hostname) => tracert www.google.be
Net view command that gives your own computer back + the ones connected into your network.