Let's take a look at the Cinder exam objectives.
The following figure breaks down various Cinder-related objectives you should be responsible for knowing on the COA exam. As you can see, all of these tasks can be completed on both the Horizon dashboard and CLI. Remember: time is of the essence during the exam, and in many cases, it can be much faster to tackle a task on the dashboard.
Figure 7.6: Cinder exam objectives can be completed on the Horizon dashboard or CLI