seq 5 deny 10.1.2.0/24 ge 25 le 27
seq 15 deny 10.2.0.0/16 ge 30 le 30
seq 20 permit 0.0.0.0/0 le 32

A.
R1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1.

B.
R1 will not create/flood a Type 3 LSA for subnet 10.1.2.0/24 into area 1.

C.
R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE.

D.
R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE.

Explanation:
When referenced from a distribute list, OSPF filters routes from being added to that router’s
IP routing table but has no impact on the flow of LSAs. As such, neither A nor B is correct.
An OSPF distribute-list command does attempt to filter routes from being added to the IP
routing table by OSPF, so the two answers that mention the IP routing table might be
correct. Sequence number 5 matches prefixes from 10.1.2.0–10.1.2.255, with prefix lengths
between 25–27, and denies (filters) those prefixes. So, the prefix list will match 10.1.2.0/26
with the first line, with a deny action. The 10.1.2.0/24 subnet does not match the first line of
the prefix list, but it does match the third line, the match all line, with a permit action.
Because 10.1.2.0/26 is matched by a deny clause, this route is indeed filtered, so it is not

added to R1’s IP routing table. 10.1.2.0/24, matched with a permit clause, is allowed and
would be in the IP routing table.