Refer to the exhibit. The network administrator is trying to configure mutual redistribution
between EIGRP and OSPF. Autosummarization in EIGRP 100 AS is disabled. After adding
OSPF configuration to router B1, the network administrator checked the routing table of
router B2, but none of the EIGRP routes appeared there.
To redistribute the EIGRP AS 100 routes into OSPF, which command should be added, or
edited, on router B1 under router ospf 10?

A.
redistribute eigrp 100 metric-type 1

B.
redistribute eigrp 100 subnets

C.
no auto-summary 10.0.0.0 255.0.0.0

D.
area 0 range 10.10.0.0 255.255.0.0

Explanation:
When redistributing into OSPF without keyword “subnets”, only classful networks will be
redistributed. Classful networks here mean networkswith the default major subnet masks
(for example 10.0.0.0/8; 180.1.0.0/16; 200.200.200.0/24…).
In fact, the routing table on the exhibit above is not totally correct. The network
192.168.110.0/24 will be redistributed and shown inthe routing table of B2 even if the
keyword “subnets” is not used because it belongs toclass C with the default subnet mask of
class C.
To make all the networks, including subnets appear in the routing table of B2 we must use
keyword “subnets” when redistributing into OSPF. This is also an important thing to
remember when redistributing into OSPF.