Best Useful Commands

Display Connection Configuration : ipconfig /all
Display DNS Cache Info Configuration : ipconfig /displaydns
Clear DNS Cache : ipconfig /flushdns
Release All IP Address Connections : ipconfig /release
Renew All IP Address Connections : ipconfig /renew
Re-Register the DNS connections : ipconfig /registerdns
Change/Modify DHCP Class ID : ipconfig /setclassid Network Connections: control netconnections
Network Setup Wizard : netsetup.cpl
Test Connectivity : ping www.whatismyip.com
Trace IP address Route : tracert
Displays the TCP/IP protocol sessions : netstat
Display Local Route : route
Display Resolved MAC Addresses : arp
Display Name of Computer Currently on: hostname
Display DHCP Class Information : ipconfig /showclassid