PSNPs are used to request or acknowledge specific link-state information. When a router detects missing information via a CSNP, it uses PSNPs to request the necessary LSPs.
It's actually AD because the CSNP only summarises LSPs in an index format, and routers may request a copy of the LSP using a PSNP if they are missing it.
AC is correct. Contained within the CSNP is a link-state PDU identifier, a lifetime, a sequence number, and a checksum for each entry in the database. Periodically, a CSNP is sent on both broadcast and point-to-point links to maintain a correct database.
In my opinion this is A nd C.
CSNPs are flooded every 10 seconds on LAN segmnet.
CSNP contains descriptions of LSP.
If neighbor router notices that something is missing, it is requesting via PSNP missing prefixes.
LSPs contain information about the state and cost of links in the network, and are flooded periodically throughout the network. PSNPs are used to acknowledge receipt of LSPs and request retransmission of missing or corrupted LSPs. PSNPs contain only descriptions of LSPs, such as their sequence numbers and checksums.
CSNPs contain a complete list of all link-state PDUs in the IS-IS database. CSNPs are sent periodically on all links, and the receiving systems use the information in the CSNP to update and synchronize their link-state PDU databases.
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