Stop someone's internet access

Code - 

@Echo off
IPconfig /release

Instructions -
Copy the above code in notepad and save it as anything.bat.Choose All Files option in Save as type while saving.
How it works -
The IP address of the computer will be lost and you will not be able to access internet anymore
How to fix it -
It is very easy.Just type the below code code in notepad and repeat the same process and you will be able to access internet

@Echo off
IPconfig /renew