CIWS and 30 mm guns form the close defense against small boats

How are modern warships designed to deal with attacks by multiple small boats?

They rely on close-in weapon systems backed by 30 mm cannon and similar short-range defensive weapons.

A small-boat swarm becomes a close-range force-protection problem. A ship first depends on its close-in weapon system to acquire and defeat the attackers. Dedicated 30 mm cannon and similar mounts provide additional arcs, human judgment, and engagement capacity against surface targets. Weapons fitted for the final defensive layer therefore have work beyond intercepting missiles.