Can point-defence weapons also protect the fleet?

Is point defence for defending the ship and area defence for defending the fleet?

That distinction is incomplete: an inner-ring escort can protect a carrier with point-defence weapons while also defending itself.

Point defence and fleet defence overlap within a task group. Ships armed with point-defence weapons can occupy the inner ring around a carrier. By defending themselves against threats entering that area, they also help defend the carrier. The distinction between point and area defence therefore needs to account for the ships' positions and the task group they protect.