An IS-IS router receives a CSNP that references an older LSP than the one in its database. What action is taken?
The router sends a copy of the LSP from its database to its neighbor.
The router sends a PSNP to its neighbor describing the LSP in its database.
The router updates its database with the LSP and floods a copy to its other neighbors.
The router sends a PSNP to its neighbor to request the LSP.
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