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Cisco IOS Lab (part 2) OS Modes Now that you've learned about router RAM, let's look at each of the modes of the Cisco Operating System and why they are each uniquely important. We'll examine what the Global Configuration Mode is and how it impacts the function and operation of the entire router, and how that differs from changes made in other modes. You'll also learn about keyboard shortcuts, which you can use to configure and should use to exit, and how to configure encrypted and unencrypted passwords.