Computer network

this is a kind of question you can just google am sure you will learn a great deal if you do that

Your question is also irrelevant to the tags. While asking hardware related question, you tagged C++ and Java.

1) First buy a switch. 2) Connect two Ethernet cables to the switch ports and plug the other side to the devices you are going to use. 3) Take another Ethernet cable and connect your switch to your router. 4) Give the power supply and check if it is working properly with the help of the blinking LED on the port.