What are three circumstances under which a router sends link-state PDUs (LSPs)?
(Choose three)
A.
LSPs are sent periodically every 9 seconds
B.
LSPs are sent when there is a network change
C.
LSPs are sent during adjacency formation
D.
LSPs are sent in response to CSNP messages
E.
LSPs are sent in response to PSNP messages
Correct answer is A-B-C
It can’t be answer E because a response to PSNP is CSNP!
A cannot be part of the right answer in this casesince LSPs are sent every 100 ms. Please see: http://www.juniper.net/techpubs/en_US/junos13.3/topics/topic-map/isis-lsp-throttling.html