Which of the following commands is necessary to fix this problem?

An internetwork has been configured as shown in the diagram, with both routers using EIGRP
routing for AS 44. Users on the Branch router are unable to reach any of the subnets on the HQ
router. Which of the following commands is necessary to fix this problem?

A.
Branch(config-router)# eigrp log-neighbor-changes

B.
Branch(config-router)# redistribute eigrp 44

C.
Branch(config-router)# version 2

D.
Branch(config-router)# no auto-summary

E.
Branch(config-router)# default-information originate

Explanation:
There are two ways to inject a default route into a normal area. If the ASBR already has the
default route in its routing table, you can advertise the existing 0.0.0.0/0 into the OSPF domain
with the default-information originate router configuration command. If the ASBR doesn’t have a

default route, you can add the keyword always to the default-information originate command (
default-information originate always ).
This command will advertise a default route into the OSPF domain, regardless of whether it has a
route to 0.0.0.0. Another benefit of adding always keyword is that it can add stability to the
internetwork. For example, if the ASBR is learning a default route from another routing domain
such as RIP and this route is flapping, then without the always keyword, each time the route flaps,
the ASBR will send a new Type 5 LSA into the OSPF domain causing some instability inside the
OSPF domain. With the always keyword, the ASBR will advertise the default inside the OSPF
domain always, and thus the flapping of the default route from the RIP domain will not cause any
instability inside the OSPF domain.
In the example shown here, only choice D is correct as the wildcard mask correctly specifies the
10.10.2.16 0.0.0.15 networks, which include all IP addresses in the 10.10.2.16-10.10.2.31 range.
Reference: http://www.cisco.com/warp/public/104/21.html