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What additional configuration statement should be included on router R4 to advertise a default route to its ne

Refer to the exhibit. EIGRP has been configured on all routers in the network. What
additional configuration statement should be included on router R4 to advertise a default
route to its neighbors?

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A.
R4(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

B.
R4(config)# ip default-network 10.0.0.0

C.
R4(config-router)# default-information originate

D.
R4(config)# ip route 10.0.0.0 255.0.0.0 10.1.1.1

Explanation:
Unlike the ip default-gateway command, you can use ip default-network when ip routing is
enabled on the Cisco router. When you configure ip default-network the router considers
routes to that network for installation as the gateway of last resort on the router.
For every network configured with ip default-network, if a router has a route to that network,
that route is flagged as a candidate default route.
Gateways of last resort selected using the ip default-network command are propagated
differently depending on which routing protocol is propagating the default route. For IGRP
and EIGRP to propagate the route, the network specified by the ip default-network command
must be known to IGRP or EIGRP. This means the network must be an IGRP- or EIGRPderived network in the routing table, or the static route used to generate the route to the
network must be redistributed into IGRP or EIGRP, or advertised into these protocols using
the network command. In this case, the 10.0.0.0 network is indeed being advertised via
EIGRP.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#i
pnetwork

13 Comments on “What additional configuration statement should be included on router R4 to advertise a default route to its ne”

    1. Marek says:

      A and D are not valid. You cannot use router R4 ip as a next hop.
      C is not a valid command for a EIGRP process.

      But you are right Brian. R4 marks it as a “candidate default” and it will not propagate it to other routers. R4 have to have a valid route to 10.0.0.0/8 network on a internet side. So because we cannot see all valid routes, and other answers are definitely wrong. We have to assume that this is a case.




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