Scrum master role

Hello,
I'm preparing to PSM I exam. I found contradiction what Scrum Guide says about SM role. It's stated that SM does not have to be on daily meetings (he/she only has to ensure team do them). One of the point for daily meetings are impediments . From other side major SM responsibility is to remove impediments. How can he/she know about them if not present on daily meetings ?

Regards
Pawel