|  | 11.2 | Why Routing Protocols are Necessary
| 11.2.1 | Static versus dynamic routes
Static route knowledge is administered manually by a network administrator who enters it into a router's configuration. The administrator must manually update this static route entry whenever an internetwork topology change requires an update. Dynamic route knowledge works differently. After a network administrator enters configuration commands to start dynamic routing, the route knowledge is automatically updated by a routing process whenever new information is received from the internetwork. Changes in dynamic knowledge are exchanged between routers as part of the update process.