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4A0-101 · Question #251

An IS-IS router receives a CSNP that references an older LSP than the one in its database. What action is taken?

The correct answer is A. The router sends a copy of the LSP from its database to its neighbor. See the full explanation below for the reasoning.

Question

An IS-IS router receives a CSNP that references an older LSP than the one in its database. What action is taken?

Options

  • AThe router sends a copy of the LSP from its database to its neighbor.
  • BThe router sends a PSNP to its neighbor describing the LSP in its database.
  • CThe router updates its database with the LSP and floods a copy to its otherneighbors.
  • DThe router sends a PSNP to its neighbor to request the LSP.

How the community answered

(51 responses)
  • A
    78% (40)
  • B
    6% (3)
  • C
    2% (1)
  • D
    14% (7)

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