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Question 62 - JN0-664 discussion

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Which two statements about IS-IS are correct? (Choose two.)

A.
CSNPs are flooded periodically.
Answers
A.
CSNPs are flooded periodically.
B.
PSNPs are flooded periodically.
Answers
B.
PSNPs are flooded periodically.
C.
PSNPs contain only descriptions of LSPs.
Answers
C.
PSNPs contain only descriptions of LSPs.
D.
CSNPs contain only descriptions of LSPs.
Answers
D.
CSNPs contain only descriptions of LSPs.
Suggested answer: A, C

Explanation:

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.

asked 18/09/2024
Robert Rek
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