Ethernet showing "network cable unplug"

sir, I have dell latitude 3540 model laptop and have window 8.1 in it .when i go to "network and sharing center in control panel >>and select change adapter setting , Ethernet icon shows red cross marks and showing status "network cable unplugged". When i diagnostics the problem i found massage . An Ethernet cable is not properly plug in or  might be broken.

Actually sir  i tried to use window 8.1 laptop as wifi router and share internet from laptop to mobile by "command prompt(admin) on DOS screen like

netsh wlan hostednetwork mode=allow ssid=name key=password

netsh wlan start hostednetwork .

sir, i have used it many times and after that i got this type of problem. i think my Ethernet cable is broken. please help me to solve my problem.