LSP Flooding JN0-664 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A network engineer is configuring a new IS-IS router in an existing network. After bringing up the adjacency, the engineer notices that the router is receiving a large number of LSPs from its neighbors. What is the correct sequence of steps the router performs when it receives an LSP?

   • ACompare the LSP to the local database, and if it is older, discard it without flooding.
   • BInstall the LSP in the database, then send a PSNP to the sender to acknowledge receipt.
   • CImmediately flood the LSP to all neighbors, then validate the checksum and install it.
   • DValidate the LSP checksum, compare it to the local database, and if newer, install it and flood to all neighbors except the one it came from.
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2. 7foundation · easy

   What is the role of a Level 1-2 (L1/L2) router with respect to LSP flooding?

   • AIt translates L1 LSPs into L2 LSPs and vice versa.
   • BIt floods all LSPs to all neighbors regardless of level to simplify the process.
   • CIt maintains separate link-state databases for Level 1 and Level 2 and floods LSPs within each level accordingly.
   • DIt floods L1 LSPs into the Level 2 backbone to ensure all routers have complete topology information.
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4. 8application · medium

   A network administrator is explaining IS-IS flooding to a junior engineer. The junior engineer asks why LSPs need to be flooded to all routers in the network. What is the primary purpose of LSP flooding?

   • ATo exchange routing information with other autonomous systems.
   • BTo ensure all routers have the same link-state database, which is used to compute shortest paths.
   • CTo provide redundancy in case of link failures.
   • DTo establish adjacencies with neighboring routers.
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5. 9expert · hard

   A service provider has a core network with a full mesh of 10 routers. They are experiencing high CPU usage on all routers due to LSP flooding. The network team is considering two options: (1) configure mesh groups on all core links, or (2) enable flooding reduction on all core links. Which approach is more appropriate for this topology?

   • AFlooding reduction, because it suppresses periodic reflooding on point-to-point links.
   • BNeither, because the flooding overhead is unavoidable in a full mesh.
   • CBoth, because they work together to reduce flooding.
   • DMesh groups, because they are designed for full-mesh topologies and reduce redundant flooding.
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6. 10foundation · easy

   How does IS-IS flooding ensure that all routers in an area have the same link-state database?

   • AEach router sends its entire database to all neighbors periodically.
   • BRouters only flood LSPs that are directly related to their own links.
   • CRouters flood every LSP they receive to all neighbors, and each router independently verifies it has the latest version.
   • DRouters use a central server to distribute LSPs.
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