Which LSA type is generated by a router for each of its networks?

The correct answer is that a Type 1 LSA, known as a Router LSA, is generated by a router for each of its directly connected networks. This type of LSA contains information about the router itself, including the state of the interfaces it has and the connected networks.

When a router participates in OSPF, it advertises its directly connected networks to other OSPF routers in the same area by creating a Router LSA. Each Router LSA includes the router's interface addresses and lists the networks that are directly connected to it. This is crucial for OSPF's link-state routing mechanism, as it allows other routers to build a comprehensive link-state database, which ultimately helps in calculating the best paths for routing.

The other LSA types listed serve different purposes: the Network LSA is used to describe the state of a multi-access network segment; the Summary LSA is intended for summarizing routing information about networks from one area to another; and the ASBR Summary LSA is specifically related to summarizing routes from an Autonomous System Boundary Router (ASBR).

Understanding the function of each LSA type is fundamental to grasping how OSPF operates and how it maintains an accurate and efficient routing table across a network