What are two characteristics of IS-IS CSNPs? (Choose two.)
A. IS-IS CSNPs contain header information for all link-state PDUs.
B. IS-IS CSNPs are used to request a copy of a missing link state PDU.
C. IS-IS CSNPs are used to maintain the link-state database synchronization.
D. IS-IS CSNPs contain header information for specific requested link-state PDUs.
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