LSP Flooding JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A network engineer is troubleshooting an IS-IS database synchronization issue. A router is missing an LSP that is present in the rest of the network. The engineer checks the router's LSP database and finds that the LSP is not present at all. What is the most likely cause?

   • AThe LSP was purged and the purge was not propagated to this router.
   • BThe LSP was never flooded to this router due to a mesh group misconfiguration.
   • CThe router's adjacency to the rest of the network is down.
   • DThe LSP was lost during flooding and the router has not yet requested it via PSNP.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   In IS-IS, what is the primary mechanism used to prevent an old LSP from being reflooded as if it were new?

   • AThe LSP's source ID
   • BThe LSP's area address
   • CThe LSP's sequence number
   • DThe LSP's checksum
   Reveal Solution Discussion Select an answer first
4. 18expert · hard

   A service provider is designing a new IS-IS network with multiple areas. They have a requirement that all routers in the network must have the same link-state database. Which of the following designs will meet this requirement?

   • AConfigure all routers as Level 1 only.
   • BConfigure all routers as Level 1/Level 2.
   • CConfigure all routers as Level 2 only.
   • DUse a single area with all routers as Level 2.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A network engineer is troubleshooting slow IS-IS convergence in a dense core network where every router is directly connected to every other router. The engineer notices that LSP flooding is causing excessive processing load on the routers. Which configuration change would most effectively reduce the flooding overhead while maintaining database synchronization?

   • AIncrease the LSP refresh interval on all routers.
   • BConfigure a mesh group on the full-mesh links.
   • CDisable checksum validation on received LSPs.
   • DSet the LSP maximum age to a lower value.
   Reveal Solution Discussion Select an answer first
6. 20expert · medium

   A network engineer is troubleshooting an IS-IS flooding issue. A router is receiving an LSP with a sequence number that is lower than the one in its database. What should the router do?

   • ASend a PSNP to the sender to request the newer version.
   • BDiscard the LSP and do nothing.
   • CInstall the LSP in its database and flood it to all neighbors.
   • DSend its newer version of the LSP to the sender.
   Reveal Solution Discussion Select an answer first