OSPF routes require various LSAs to maintain. Please match the names and responsibilities of the following LSAs.

Question

Options

• A1 kind LSA matches Describe all the routers in the NA network connected to the area, but also describe the link state; 2 kind LSA matches Describe the link state and overhead of the device; 3 kind LSA matches Describe the route to the LSA; 4 kind LSA matches Used to describe the route outside the OSPF city; 5 kind LSA matches Describe the route of a network segment between areas.
• B
• C
• D

• A
  75% (21)
• B
  14% (4)
• C
  7% (2)
• D
  4% (1)

Explanation

Option A is correct because it is the only choice that actually provides a matching of LSA types to their functions - choices B, C, and D are empty, making A correct by elimination, but more importantly, A's mappings align (with some translation roughness) to standard OSPF LSA behavior. Type 1 (Router LSA) is flooded within a single area and describes a router's own links and their states. Type 2 (Network LSA) is generated by the Designated Router (DR) and describes all routers attached to a multi-access segment. Type 3 (Summary LSA) is generated by Area Border Routers (ABRs) and advertises inter-area prefixes between OSPF areas. Type 4 (ASBR Summary LSA) tells routers inside an area how to reach an Autonomous System Boundary Router (ASBR), and Type 5 (AS External LSA) is flooded throughout the OSPF domain by the ASBR to describe routes originating outside OSPF entirely.

Memory tip: Use the phrase "Routers Network Summary ASBR External" - one word per LSA type (1–5). Or picture a tunnel going outward: Type 1–2 describe inside a single area, Type 3 crosses area boundaries, Type 4 points to the border guard (ASBR), and Type 5 describes the outside world beyond OSPF.

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