So basic, it hurts to ask......

hey guys checked with the above info.... to give a more clear picture of how cross over cables work here it goes

:idea: So pin 1 -> pin 3,
pin 2 -> pin 6,
pin 3 -> pin 1,
and pin 6 -> pin 2.
All of the other pins are left open :idea:

to connect to similar devices we use cross over cables( computer to computer using ethernet cabel), and to connect to different devices we use straight through (connecting modem with a router).....

You'll be pleased to know we have the topic covered extensively, just following this link :

www.firewall.cx/cabling_xover.php

With the same cool 3d pictures too