Which LSAs in OSPFv3 can be flooded within an area? (Multiple choice)

Question

Options

• AInter-Area-Prefix-LSA
• BInter-Area-Router-LSA
• CLink-LSA
• DIntra-Area-Prefix-LSA

• A
  72% (23)
• C
  28% (9)

Explanation

In OSPFv3, LSAs are classified by flooding scope: link-local, area, or AS-wide. Options A, B, and D are correct because the Inter-Area-Prefix-LSA (Type 3), Inter-Area-Router-LSA (Type 4), and Intra-Area-Prefix-LSA (Type 9) all carry area flooding scope - they are distributed to all routers within a single OSPF area by the ABR or originating router.

Option C, the Link-LSA (Type 8), is the distractor. It has link-local flooding scope only, meaning it never crosses beyond the local link - its purpose is to advertise a router's link-local address and on-link prefixes to neighboring routers on the same segment, not to the broader area.

Memory tip: If it has "Area" in the name (Inter-Area, Intra-Area), it floods within an area. The Link-LSA is the odd one out - think "Link = Local" - it stays confined to the link it was generated on, just like link-local addresses themselves don't route beyond the local segment.

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