Which brain networks do these actions involve?

I’m a bit confused about definitions of the default network and executive network of the brain. I read that the default network has to do with the mind wandering and executive network with tasks. Personally, I can’t always tell the difference in my thinking, which seems to be always on, unless I meditate.
Which networks are involved when planning, strategizing? What about playing back events from the day (positive and negative)? What about meditating?