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In an EIGRP network, how do you advertise a default route to all the routers?

There are a few ways to advertise a default route to the rest of the network.

1. Create a static route on the border router (of the EIGRP domain) and redistribute it into EIGRP.
2. Create a summary route (0.0.0.0) on the border router.
3. Use the default-network command on the border router to generate a default route.

The 2nd and 3rd techniques will give you the output you've shown.

default-network is a hold over from classful routing and is rarely used anymore.

Cisco has some good explanations here and here.