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The behavior described is the fundamental operational principle of OSPF ' s hierarchical area structure.

LSA Flooding Scope: In OSPFv2, Type-1 (Router) and Type-2 (Network) Link-State Advertisements (LSAs) are restricted to a local area flooding scope . They contain detailed topology information (such as which routers are connected to which links) that is only relevant for calculating the Shortest Path First (SPF) tree within that specific area.

ABR Functionality: Area Border Routers (ABRs), such as R1 in this scenario, act as the gateway between areas. The ABR does not forward Type-1 or Type-2 LSAs from one area to another. Instead, it extracts the prefix information (the network address and mask) from those LSAs and generates a Type-3 (Summary) LSA .

Interarea Reachability: This Type-3 LSA is then flooded into the backbone (Area 0) and subsequently into other non-backbone areas, such as Area 2. This explains why R2 sees an " interarea route " to R3’s network in its routing table and has the corresponding Type-3 LSA in its database, but cannot see the original Type-1 or Type-2 LSAs from Area 1.

Why other options are incorrect: Option A is incorrect because this is standard protocol behavior, not the result of a manual filter. Option B is incorrect as there is no such " disable " feature; the protocol design inherently prevents these LSAs from crossing boundaries. Option C is incorrect because OSPFv3 still uses Type-1 and Type-2 LSAs (renamed but functionally similar for topology), and the prompt specifically identifies the deployment as OSPFv2 .