Some handy hints and tips about Networking:
A network pinout guide
IPCONFIG: If you have problems with local network on PC’s and laptops, IPCONFIG can help with MOST of these issues IF they are caused by software. If you switch routers etc. then this is an essential piece of kit. Open Windows Command Line Interface in ADMIN Mode and copy and paste these commands.
As an extra ipconfig /registerdns
Here is an explanation of each command: