Cisco Certified Network Associate (CCNA) 2026 – 400 Free Practice Questions to Pass the Exam

The main purpose of the Network LSA (Link State Advertisement) is indeed to list routers in the same segment. In OSPF (Open Shortest Path First), a Network LSA is generated by the designated router on a multi-access network like Ethernet. This LSA specifies the routers that are present on the network segment and identifies them within the OSPF routing domain.

By distributing this information, routers can maintain an accurate view of the network topology, allowing them to effectively calculate the shortest path to each destination network. The inclusion of all routers in the segment within the Network LSA facilitates the OSPF process of building a link-state database (LSDB) which is critical for OSPF's operation in determining the best routes.

Focusing on the other choices: while other LSAs exist for summarization and path selection, it is the Network LSA that specifically addresses the list of routers. This unique function is vital in ensuring all OSPF routers within the same broadcast or non-broadcast multi-access (NBMA) network segment can discover each other and maintain routable paths within the network.