Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

The type of LSA that advertises a summary LSA for a specific ASBR is known as a Type 4 LSA. In Open Shortest Path First (OSPF) routing protocol, Type 4 LSAs are specifically used to identify an Autonomous System Boundary Router (ASBR) within an OSPF area. This type of LSA provides information essential for routing packets destined to external networks that the ASBR can reach.

When an OSPF network includes routes to networks outside the local OSPF domain, a Type 4 LSA is generated by the Area Border Router (ABR) to inform other OSPF routers about the location of the ASBR. This is crucial for routers located within an area to correctly route packets toward external destinations.

Type 5 LSAs are utilized to advertise external routes into the OSPF domain but do not specifically relate to summarization for the ASBR. Type 7 LSAs are associated with Border Gateway Protocol (BGP) when using OSPF in a Network-to-External (N2E) context, while Type 2 LSAs pertain to network advertisements in OSPF and do not focus on ASBRs. Therefore, Type 4 LSAs