Some routers have been configured with default routes. What are some of the advantages of
using default routes? (Choose two)

A.
They establish routes that will never go down.

B.
They keep routing tables small.

C.
They require a great deal of CPU power.

D.
They allow connectivity to remote networks that are not in the routing table

E.
They direct traffic from the internet into corporate networks.

Explanation:
Cisco administration 101: What you need to know about default routesr

http://www.techrepublic.com/article/cisco-administration-101-what-you-need-to-know-aboutdefault-routes/