Cisco Enterprise Network Core Technologies (ENCOR) 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer is Type 2 because it specifically advertises multi-access network segments in OSPF (Open Shortest Path First). In OSPF, Type 2 Link-State Advertisements (LSAs) are used to represent networks that are connected to a broadcast or multi-access network, such as Ethernet.

In a multi-access environment, multiple routers can connect to the same network segment and, thus, require a designated router (DR) to minimize the amount of routing information exchanged and to prevent network flooding. The Type 2 LSA contains information about the DR and Backup Designated Router (BDR) along with the list of routers connected to that network segment. This allows OSPF to efficiently manage routing information across networks with several attached devices.

Other LSA types have different functions: Type 1 LSAs denote router information within a specific area, Type 3 LSAs are used for summarizing routes between areas, and Type 4 LSAs are used to advertise ASBR (Autonomous System Boundary Router) information. Each of these has a distinct role in OSPF’s operation, which is why they do not pertain to advertising multi-access network segments like Type 2 LSAs do.