Cisco Certified Network Associate (CCNA) Practice Exam

What type of LSA is responsible for propagating Inter-area routes in OSPF?

1. Type 1 - Router LSA

2. Type 2 - Network LSA

3. Type 3 - Summary LSA

4. Type 4 - ASBR Summary LSA

The correct answer is: Type 3 - Summary LSA

The type of LSA responsible for propagating inter-area routes in OSPF (Open Shortest Path First) is indeed a Summary LSA, which is classified as Type 3. Summary LSAs are utilized to advertise routes between different OSPF areas, allowing OSPF to provide a streamlined method for sharing routing information efficiently. This is essential in a multi-area OSPF environment, as it helps maintain a compact and manageable routing table by summarizing the routes from one area into another, rather than flooding every route individually across the areas. In the context of OSPF LSAs: - Router LSAs (Type 1) are used by routers to describe the links within their area and do not include inter-area route information. - Network LSAs (Type 2) are generated by the designated router for broadcast and non-broadcast multi-access networks, providing information about the routers connected to the network, but again, they do not propagate inter-area routes. - ASBR Summary LSAs (Type 4) advertise the presence of an Autonomous System Boundary Router (ASBR) and its associated routes, but they serve a different function specifically tied to external route information rather than general inter-area routing. Therefore, Type 3