Explanation/Reference:
Explanation:
We are checking the routing table on EIGRP routers not OSPF so we don't need to check the seed metric for OSPF. Besides OSPF doesn't need to specify seed metric as all external routes get a default metric of
20 (except for BGP, which is 1) -> A is not correct.
We must specify seed metrics when redistributing into EIGRP (and RIP). If not all the redistributed routes will not be seen but the question says only some routes are missing -> B is not correct.
The default administrative distance for external routes redistributed into EIGRP is 170 so we don't need to set it -> C is not correct.
We should check the routing table of the border router to see the missing OSPF routes are there or not. An incorrect distribute-list can block some routes and we can't see it in other EIGRP routers -> D is correct.
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Answer D is obvious that we should check all the routes we want to redistribute are present in the routing table of the border router. Let's discuss about answer E.
A rule of thumb when redistributing into OSPF is we should always include the "subnets" keyword after the redistributed route. For example:
router ospf 1
redistribute eigrp 100 subnets
This keyword makes sure all of the routes, including subnets are redistributed correctly into OSPF. For example these routes are learned via EIGRP:
+ 192.168.1.0/24
+ 192.168.2.0/25
+ 192.168.3.0/26
Then without the keyword "subnets", only 192.168.1.0/24 network is redistributed into OSPF.