You’re running several Compute Engine instances and want to restrict communication between the instances to the paths and ports you authorize. You don’t want to rely on static IP addresses or subnets, because you are working on a web app that is intended to autoscale. How should you restrict communications?

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You’re running several Compute Engine instances and want to restrict communication between the instances to the paths and ports you authorize. You don’t want to rely on static IP addresses or subnets, because you are working on a web app that is intended to autoscale. How should you restrict communications?