Static IP routing. An administrator manually configures routing information, and routing information does not change unless the administrator manually updates or deletes it. Using static routing exclusively is appropriate only for a small internetwork.
Dynamic IP routing. An administrator configures a router to use a dynamic routing protocol. A router that uses a dynamic routing protocol automatically generates routing information, shares that information with other routers, and updates the information when routing changes occur. A large internetwork that primarily uses dynamic routing typically also uses some manually configured static routes.