Look at your network from a different point of view, like a hacker would. If you were going to attack your network, what weak points would you look for? Be brutally honest with yourself. Don’t be afraid to bring in a third-party penetration tester to test your network security. When it comes to your network configuration, consider micro-segmentation of your network, with each department or group on their own subnet. This will make it more difficult for a hacker to move around your network, should they get past your firewall
