A knowledge base article about Do I need to do a 2-Step verification every time I log into CalNet? provided by the UC Berkeley IT Service Hub - Knowledge Portal
Yes, but you can also tell Duo to trust your web browser to prevent having to 2-Step all day, every day. Telling your browser to remember your 2-Step authentication means you will not need to 2-Step when you log in to CalNet in that specific web browser and on that specific computer during that time frame.
The next time you're prompted for 2-Step, when asked "Is this your device?", select the "Yes, this is my device" button and the browser will automatically remember you for 30 days. Note: you will have to make this selection for every browser or computer you use -- selecting it once does not apply on any other browser or computer.
Do not ask your browser to remember you on a shared or public computer.
For more information and answers to other common questions, please see 2-Step FAQ.