LSP Flooding JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the primary benefit of configuring flooding reduction on an IS-IS interface?

   • AIt reduces the number of LSPs sent on that interface by relying on periodic CSNPs to synchronize the database.
   • BIt increases the speed of LSP flooding by sending LSPs immediately without any delay.
   • CIt compresses LSPs to reduce bandwidth usage.
   • DIt prevents LSPs from being flooded on that interface to avoid loops.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A network administrator is troubleshooting an IS-IS database synchronization issue. A router in the network is not receiving a newly originated LSP from a remote router. The administrator checks the local router's LSP database and finds the LSP is present with a sequence number that is lower than expected. What is the most likely cause?

   • AThe LSP was purged and is being reflooded with a higher sequence number.
   • BThe LSP was received from a neighbor but not reflooded due to a mesh group configuration.
   • CThe LSP is an older version that was not updated because the newer LSP was lost during flooding.
   • DThe LSP is being held in the CSNP/PSNP process and not yet installed.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   How does the remaining lifetime (Remaining Lifetime) field in an LSP help prevent flooding loops?

   • AIt causes routers to discard LSPs with a low remaining lifetime.
   • BIt prevents a router from reflooding an LSP back to the neighbor it received it from.
   • CIt limits the number of times an LSP can be reflooded.
   • DIt ensures that an LSP is eventually removed from the network if it is not refreshed.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   An engineer is analyzing a packet capture during an IS-IS LSP flooding event. The engineer sees the same LSP being transmitted multiple times on the same link. Which mechanism is designed to prevent an LSP from being flooded back to the router that originally sent it?

   • AThe source ID in the LSP ID.
   • BThe sequence number in the LSP header.
   • CThe neighbor state machine and the LSP database.
   • DThe remaining lifetime field in the LSP header.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   After an IS-IS router validates and installs a newly received LSP in its link-state database, what does it do next?

   • AIt refloods the LSP to all neighbors except the one from which it was received.
   • BIt sends the LSP only to the designated router on broadcast networks.
   • CIt discards the LSP after updating its database to prevent loops.
   • DIt waits for a CSNP from a neighbor before reflooding.
   Reveal Solution Discussion Select an answer first