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An IS-IS router on a broadcast medium has detected its LSDB is missing an LS PDU. Which action will the router take?
Correct Answer: C
Explanation/Reference: A Partial SNP (PSNP) is similar to CSNP except that it describes only some LSPs rather than the entire database. On a P2P network, PSNP is used to acknowledge received LSPs. On a LAN network, PSNP is used to request missing or latest LSPs. Incorrect Answers: A: IS-IS Sequence Number PDU (SNP) SNPs are used to maintain IS-IS LSDB by describing some or all of the LSPs in the database. The DIS periodically multicast Complete SNP (CSNP) to describe all the LSPs in the Pseudonode database. References: https://sites.google.com/site/amitsciscozone/home/is-is/is-is-packets