Click the exhibit button. In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. Assuming that there are no stub networks, which of the following statements regarding Type 4 LSA generation is true?
A.
Router R1 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.
B.
Router R3 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.
C.
Router R3 generates a Type 4 LSA that is flooded to areas 0 and 2.
D.
Router R3 generates a Type 4 LSA that is flooded to area 0, and router R6 generates a Type 4 LSA that is flooded to area 2.
The type 4 LSA is an LSA that instructs the rest of the OSPF domain how to get to the ASBR so that others in the OSPF domain can route to external prefixes redistributed into OSPF by the ASBR.
If we have no way to reach the ASBR that redistributed the routes, we obviously can’t reach the external route. Makes sense, right?
So type 4 LSA tell the routing domain how to reach ASBRs to route outside its own doamin.
However, we sometimes hear that ASBRs inject a type 4 LSA into OSPF. This is simply not true.
The ABRs of the area where we have the ASBR are responsible for injecting type 4 LSAs to the adjacent areas.
upvoted 2 times
...
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Kri8or
Highly Voted 5 years, 6 months agoKri8or
Most Recent 5 years, 6 months ago