Which OSPF LSA Type summarizes information for another area?

The correct answer is Type 3. This LSA (Link State Advertisement) type, also known as a Summary LSA, is specifically designed to summarize routes from one OSPF area to another. When a router is configured to operate in an OSPF network, it will generate Type 3 LSAs to communicate summarized routing information from one area to other areas. This is especially useful in reducing the amount of detailed routing information that must be managed and shared across the different OSPF areas.

By using Type 3 LSAs, routers can efficiently inform other areas about the networks that are reachable through different areas without having to send a detailed list of each route, thus optimizing the OSPF routing process and enhancing network stability and scalability. An OSPF area border router (ABR) is responsible for generating these summary LSAs when it advertises routes from one area to another.

Type 1 LSAs refer to router advertisements and contain information about the routers within the same area without summarization. Type 2 LSAs are used for network advertisements and pertain to multi-access networks, providing information about the designated router. Type 4 LSAs, on the other hand, are used to indicate the route to an ASBR (