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Apps use multicast networking to see and talk to other devices on their local networks. For example, an app might discover smart lightbulbs connected to a person’s Wi-Fi network and send them messages to turn on or off the lights. While the ability to discover and communicate with all devices on a local network is a powerful tool, those devices may carry sensitive personal information that could be used to build a marketing profile or to predict when people might be at home. iOS 14 brings transp...