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i cut my fingers a lot and get a lot of mistakes on networks connection on my first career because of that question ?i
By the coler code
with the checking a colour codes
If the cable is already installed the most easy way is to perform a PING test between the two nodes using the cable.
when you install the wired cable RJ45 both sides should have the same sequance of colors and all the pins are attached well, when you plugedin the RJ if the connection correct it should haf flashed (usually green and yellow) then do ping test ip addres of which is connect to
we always look to RJ45 from front or back , did you try before to look to it from side view
Check the Cables and paired wire touches the end of notch(RJ45 connector) both the end. one end goes in a router or a switch,the other side in the Ethernet card that is connect to computer. when connected the both sides of the cables in a Switch/Router then there is a LED(Green ,Yellow,Orange) is activated and blinks at both the ends. That is NIC Led and switch Led). open command prompt,try to ping other computer NIC(network interface card),if it gives you reply.then its all fine.
Thanks for reading,
Regards,
Ahmed.
check that the end of pins is touching the end of the RJ45 connecter