What is the minimal insurance I need to get on my rental car?

I will be renting a car in L.A. next month. I have minimal car insurance on my car, and my agent told me I do not have any coverage on a rental car. What is the minimum mandated by law that I must purchase from the rental car company? I know that there are 2 or 3 different types – I want to make sure I am buying only what is mandated by law. What is that called?