One point of confusion for some CCNA and CCNP candidates is the difference between configuring a static default route and using the Cisco routing command ip default-network.
At first glance, they appear to do the same thing. Both configure a destination to which packets should be routed if there is no more specific route in the routing table.
The major difference between these two options is that configuring a static default route only defines a default route for the router you’re configuring it on, while ip default-network will propagate the route via its routing protocol.
Let’s examine the routing tables of a hub-and-spoke network using the ip default-network command. R1 is the hub and R2 and R3 are the spokes. They are directly connected via the network 172.12.123.0 /24, and each has a loopback with a 32-bit mask that are numbered according to the router number (1.1.1.1, etc.) RIP is running on all three routers and the loopbacks are advertised.
R1 has another serial interface with the IP address 10.1.1.1 /24, and this network has been flagged as a default network with the command ip default-network 10.0.0.0 . It is not being...
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