Exam 350-401 topic 1 question 125 discussion

LSA Type 1: Router LSA LSA Type 2: Network LSA LSA Type 3: Summary LSA LSA Type 4: Summary ASBR LSA LSA Type 5: Autonomous system external LSA LSA Type 6: Multicast OSPF LSA LSA Type 7: Not-so-stubby area LSA LSA Type 8: External attribute LSA for BGP https://networklessons.com/ospf/ospf-lsa-types-explained D. Type 4

D is correct Type 1 (Router LSA): Generated by every router, it contains information about the router's directly connected links and their states. Type 2 (Network LSA): Generated by the Designated Router (DR) on a multi-access network, it contains information about all the routers on the segment. Type 3 (Summary LSA): Generated by Area Border Routers (ABRs), it advertises routes between different OSPF areas. Type 4 (ASBR Summary LSA): Generated by ABRs to inform other routers within the OSPF area about the existence of ASBRs. This LSA points to the ASBR and provides a way for internal routers to reach external routes through the ASBR.

Type 3 is the ABR and Type 4 is the ASBR

Type 1 - Router LSA - by all routers within the area Within the area Type 2 - Network LSA - DR (Designated router) - Within the area Type 3 - Summary LSA - ABR (Area Border Router) - Within the network Type 4 - ASBR Summary - ABR (Area Border Router) - Within the network Type 5 - AS-external LSA - ASBR (Autonomous System Boundary Router) - Within the network Type 6 - Group Membership LSA - Type 7 - NSSA External LSA - ASBR (Autonomous System Boundary Router) - Intra-area Type 8 - Link-local LSA (OSPFv3) - by all routers - within the area Link Type 9 - Link-local opaque (OSPFv2) - Link-local - Type 9 - Intra-Area-Prefix (OSPFv3) - Link-local Type 10 - Area-local opaque - Area-local Type 11 - Autonomous System opaque - Within the network

D for sure! LSA 4 ==> These are LSA's that announces the presence of an ASBR to other areas

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