Which statement is true about IS-IS PDUs?

Which statement is true about IS-IS PDUs?
A . Separate CSNP and PSNP types exist for Level 1 and Level 2 systems.
B . Both the DIS and the backup DIS broadcast CSNPs over a broadcast link.
C . PSNPs contain header information for all link-state PDUs in the IS-IS database.
D . CSNPs are exchanged only during initial adjacency establishment when a complete LSDB is being built.

View Answer

Answer: A