Cisco ENCOR Practice Exam 2026 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

The type of Link State Advertisement (LSA) known as a Router LSA is classified as Type 1. Router LSAs are generated by every router in an OSPF (Open Shortest Path First) network to describe the router's interfaces, the state of those interfaces, the cost associated with reaching them, and the router's relationships with other routers in the same area.

Type 1 LSAs are fundamental to the OSPF protocol because they contain critical information about the local topology, thus allowing other OSPF routers within the same area to make informed decisions about path selection based on the state and cost of routes. Each router in an OSPF area sends these advertisements to all other routers in that area, enabling them to build a comprehensive view of the network topology.

Other LSA types serve different purposes. For instance, Type 2 LSAs are used for network LSAs, representing multi-access networks like Ethernet where a designated router is elected to reduce the number of LSAs sent. Type 3 LSAs are summary LSAs used to convey route summarization between areas. Type 4 LSAs are used to advertise ASBR (Autonomous System Boundary Router) information. Understanding these distinctions helps clarify the role of Router