I have arduino UNO r3 ATMEGA 328P board and this kind of a cable. But I want to make and test a program that need to get the data through ethernet port. Can I do only with them. I want to know whether they are enough to that (there are any converter or virtual devices) or should I buy anything.

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You can do the programming of the Arduino through the USB cable, but in order to test and operate the program, you'll need an Ethernet shield and a cable to connect that to the LAN.

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