Which OSPF LSA type points to the ASBR?
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Correct answer: type 4.
Why this is the answer
Type 4 LSAs (ASBR Summary LSAs) are generated by ABRs (Area Border Routers) to advertise the location of an ASBR (Autonomous System Boundary Router) to other areas within the OSPF domain. This LSA essentially tells routers in other areas how to reach the ASBR, which is necessary for inter-area routing to external destinations. Type 1 LSAs (Router LSAs) describe the router's directly connected links and their states within its own area. Type 2 LSAs (Network LSAs) are generated by the DR (Designated Router) on a multi-access segment to list all routers on that segment. Type 3 LSAs (Summary LSAs) are generated by ABRs to advertise networks from one area to other areas. While type 3 LSAs advertise networks, they do not specifically point to the ASBR itself.
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