(Topic 1) Which of the following statements regarding the IS-IS CSNP is false?

(Topic 1) Which of the following statements regarding the IS-IS CSNP is false?
A . CSNPs are used to maintain consistency in the link state database.
B . CSNPs are advertised before an adjacency is formed with another router.
C . There are two types of CSNPs: Level 1 and Level 2.
D . CSNPs are advertised after an adjacency is formed with another router.

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Answer: B