|  | 12.1 | Initial Router Configuration
| 12.1.6 | The ip default-network command

The ip default-network command establishes a default route in networks using dynamic routing protocols.. - A default network must exist in a routing table. Default routes keep routing tables shorter. When an entry for a destination network does not exist in a routing table, the packet is sent to the default network. Because a router does not have complete knowledge about all destination networks, it can use a default network number to indicate the direction to take for unknown network numbers. Use the default network number when you need to locate a route, but have only partial information about the destination network. The ip default-network command must be added to all routers in the network or used with the additional command redistribute static so all networks have knowledge of the candidate default network.