Which OSPF LSA type carries routes that summarize inter-area destinations?

Which OSPF LSA type carries routes that summarize inter-area destinations?

• A. Network-LSA
• B. Router-LSA
• C. Summary-LSA
• D. AS-External-LSA

Answer: (C)

Inter-area routing in OSPF uses Summary-LSAs generated by area border routers to advertise networks from one area into another. These Summary-LSAs carry routes that summarize inter-area destinations, allowing routers in the receiving area to learn about networks in other areas with a concise, summarized metric rather than flooding full topology details. This helps scale OSPF by reducing the number of LSAs and limiting the scope of topology information that must be processed across areas. Other LSA types serve different roles: router-LSA describes a router’s links, network-LSA describes networks within a broadcast segment, and AS-External-LSA carries routes redistributed from external protocols into the OSPF domain.

Inter-area routing in OSPF uses Summary-LSAs generated by area border routers to advertise networks from one area into another. These Summary-LSAs carry routes that summarize inter-area destinations, allowing routers in the receiving area to learn about networks in other areas with a concise, summarized metric rather than flooding full topology details. This helps scale OSPF by reducing the number of LSAs and limiting the scope of topology information that must be processed across areas. Other LSA types serve different roles: router-LSA describes a router’s links, network-LSA describes networks within a broadcast segment, and AS-External-LSA carries routes redistributed from external protocols into the OSPF domain.