In IS-IS database synchronization, each router compares each LSP described in the received CSNPs with the LSPs in its own database. Which of the following actions is taken if the database contains a newer copy of the LSP?
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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