Cisco Updated 300-410 Exam Questions and Answers by blair

OSPF type 1 route is always preferred over a type 2 route for the same destination so we can set

metric-type 1 at Site-A RTR1 so that it is preferred over Site-B RTR2.

Note:

Routes are redistributed in OSPF as either type 1 (E1) routes or type 2 (E2) routes, with type 2 being

the default.

– A type 1 route has a metric that is the sum of the internal OSPF cost and the external redistributed

cost.

– A type 2 route has a metric equal only to the redistributed cost.

– If routes are redistributed into OSPF as type 2 then every router in the OSPF domain will see the

same cost to reach the external networks.

– If routes are redistributed into OSPF as type 1, then the cost to reach the external networks could

vary from router to router.

The command “ip nhrp map multicast dynamic” allows NHRP to automatically add spoke routers to the

multicast NHRP mappings.

For OSPF, we can only summary at the ABR with the command “area range” or at the ASBR with the command “summary-address” -> Therefore answer A and answer B are not correct.

In this question, the most likely problem is that when doing summarization, the network mask is configured wrong and summarization doesn’t work because of the misconfiguration. When configuring the area range command, make sure that the summarization mask is in the form of a prefix mask rather than a wildcard mask (that is, 255.255.255.0 instead of 0.0.0.255).

Good reference: https://www.configrouter.com/troubleshooting-route-summarization-ospf-14082/