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You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options are valid checks that should be performed first to verify proper OSPF operation? (Choose two.)
Correct Answer: A,C
Explanation/Reference: Explanation A totally stubby stubby area cannot have an ASBR so it will discard this type of LSA (LSA Type 5) -> A is a valid check. Each stubby area needs an ABR to communicate with other areas so it is normal -> B is not a valid check. When pulling routes into OSPF, we need to use the keyword subnets so that subnets will be redistributed too. For example, if we redistribute these EIGRP routes into OSPF: + 10.0.0.0/8 + 10.10.0.0/16 + 10.10.1.0/24 without the keyword subnets router ospf 1 redistribute eigrp 1 Then only 10.0.0.0/8 network will be redistributed because other routes are not classful routes, they are subnets. To redistribute subnets we must use the keyword subnets router ospf 1 redistribute eigrp 1 subnets -> C is a valid check. We don`t need to care if area 0 is contiguous or not -> D is not a valid check. CPU utilization cannot be the cause for this problem -> E is not a valid check.