Click on the exhibit.
The routers have an established IS-IS L2 adjacency on which IPv4 system addresses are exchanged. An operator successfully configures multi-topology IS-IS routing so that the IPv6 system addresses are also exchanged between routers.
After IPv6 has been configured, which of the following is TRUE?
Router R2 has two IS-IS adjacencies. Since multi-topology IS-IS routing has been configured for both IPv4 and IPv6, separate LSDBs (Link-State Databases) are maintained for each address family. This means that each adjacency will have a corresponding LSP for IPv4 and a separate LSP for IPv6. Therefore, Router R2 will exchange two LSPs per adjacency: one for IPv4 and one for IPv6. With two adjacencies, Router R2 will have a total of four LSPs.
Why 3 LSP my friends?
same question here.
According to wat I've found out, adjacency between devices is an L2. So there should be 3 LSPs, one for each - one L2 LSP for R2, one L2 LSP for R3 and one L2 LSP for R1.