Q9 Multiple choice Mark for later What are two characteristics of IS-IS CSNPs? (Choose two.) Select all that apply. 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. Correct answer