Ethernet cables are needed for internet connectivity. If you are having issues, you can do a simple test to see if it is faulty.

Sure, you can buy a cable tester, but what fun is that? [Ashish] posted a nice looking cable tester that you can build with or without an onboard Arduino. If you don’t use an Arduino, the pro… ...

Cutest Ethernet Cable Checker Ever at Thinkgeek Networking gadgets tend to be ugly, bulky bastards with scant attention paid to aesthetics.