If you travel regularly with your Mac or iOS device, you likely find yourself connecting to new Wi-Fi networks: at airports, in train stations, in hotels, restaurants, pubs, or at clients’ offices. Whether you connect to these networks with your Mac, iPhone or iPad, miraculously, your devices will remember these networks and sync them via iCloud — so your other Apple products can access them too, if you use iCloud Keychain.
Your Apple device’s ability to remember previously connected to networks can be both good and bad. While it means you don’t have to search for or remember login credentials when you connect to a known Wi-Fi network on a different device, it can lead to a surfeit of Wi-Fi networks stored in your keychain and potentially allow you to unknowingly connect to a Wi-Fi network that might not be secure.
You can cull these Wi-Fi networks, but only on a Mac. Read on and we’ll show you how to remove these Wi-Fi networks so your Macs and iOS devices forget them.
Read the rest of the article on The Mac Security Blog.