How To Check NIC Card Working or Not?

1) Right Click on My Computer ->Select Properties and display's the System Properties:
2) Go to HARDWARE-> select Device Manager


3) In the Device Manger Expand the Network Adapter by clicking on + symbol and Here it shows NIC Card right click on that Name(RealTech..etc) select properties



4) Make sure, that the "Device status" is: "This device is working properly".
if not, use the button "troubleshooting"