question: How to use Network Lock
answer: 
  What can a VPN do?
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  Network Lock is ExpressVPN’s kill switch. If your VPN connection unexpectedly drops, Network Lock blocks all internet traffic, keeping your data safe.
  
  Network Lock is available in the ExpressVPN app for Windows, Mac, Linux, and routers.
  
  Note: In the ExpressVPN app for Android or iOS, Network Lock is known as network protection. You can find instructions on using network protection for Android and iOS respectively.
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  How does Network Lock work?