Troubleshoot OSPF (v2/v3)
4 practice questions under this official exam objective (300-410) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
How to Make OSPF Area 1 Totally Stubby on R2
OSPF area 1 on R3 must see only Type 1 and Type 2 LSAs, which requires making it a totally stubby area from the ABR R2. This page confirms that the co
Which ACL permits OSPF type 5 LSAs for 132.108.2.0 and .3.0?
R1 is missing OSPF type 5 external LSAs for 132.108.2.0/24 and 132.108.3.0/24 because the filtering ACL does not cover both prefixes. This page establ
Why Are OSPF Neighbors Stuck in ExStart/Exchange on DNA Assurance?
When Cisco DNA Assurance flags an OSPF adjacency that never leaves the ExStart/Exchange state, the culprit is almost always an interface MTU mismatch
Why Is R1 Not Forming OSPF Adjacency with a Mismatched NSSA Option Bit?
R1 fails to form an OSPF adjacency on a point-to-point link because the routers disagree on the area type, producing a mismatched NSSA/stub option bit