Choose a device that you will use for 2-Step Verification every time you log in to CalNet on your computer.
Your verification device is not the computer you use to do your work, but another device that you have with you when you are working, such as your smartphone.
2-Step Verification Devices
You can set up multiple verification devices. In fact, we recommend that you enroll at least two verification devices so that you can still log in if you lose one.
Once you enroll in CalNet 2-Step Verification, you will always need to have your verification device available when you log in to CalNet.
Get more tips on doing the 2-Step here.
Backup passcodes are useful in case you lose your phone or other verification device, or if you're in a location where cellular or WiFi service is weak. After registering your device, print out your backup passodes.