Link-State Database JN0-352 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the primary purpose of LSP flooding in IS-IS?

   • ATo periodically refresh the routing table on each router
   • BTo ensure all routers in the area receive the same LSPs and maintain synchronized databases
   • CTo discover neighboring routers and establish adjacencies
   • DTo elect the designated intermediate system (DIS) on a broadcast network
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   Which type of information is carried in an IS-IS Link-State PDU (LSP)?

   • AThe complete routing table of the originating router
   • BThe list of all IP prefixes in the autonomous system
   • CThe router's directly connected neighbors and their associated metrics
   • DThe authentication keys used to secure IS-IS adjacencies
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A network administrator is examining the link-state database on a Junos router and sees an LSP with a remaining lifetime of 400 seconds. The administrator knows the LSP was originally generated with a lifetime of 1200 seconds. What does this information indicate about the LSP?

   • AThe LSP is 400 seconds old and will be flooded again when its lifetime reaches 800 seconds to keep the database synchronized.
   • BThe LSP is 800 seconds old and will be purged from the database when its lifetime reaches zero, unless it is refreshed by the originating router.
   • CThe LSP has been refreshed 800 seconds ago and will remain in the database for another 400 seconds before being re-flooded.
   • DThe LSP has a sequence number that is 400 seconds old, and the router will send a CSNP to request a new copy from the originator.
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A network engineer is troubleshooting a routing loop in an IS-IS Level 2 area. After examining the link-state database on all routers, the engineer notices that Router R4's LSP is missing from R7's database, even though R4 and R7 are in the same area. Which two-step process should the engineer use to identify the root cause?

   • AVerify that R4's LSP is present in the databases of R4's directly connected neighbors, then trace the flooding path from R4 to R7 using traceoptions on intermediate routers.
   • BCompare the LSP sequence numbers on R4 and R7, then manually inject R4's LSP into R7's database using the 'clear isis database' command.
   • CReview R4's LSP generation interval and hold time, then increase the LSP refresh interval on all routers to ensure the LSP is propagated.
   • DCheck R7's IS-IS adjacency state with all its neighbors, then verify that R7's interface MTU is set to at least 1500 bytes.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   What is the effect of setting the overload bit in an IS-IS LSP?

   • AThe router will stop sending Hello PDUs and drop all adjacencies
   • BOther routers will not use this router as a transit path in their SPF calculations
   • CThe router will remove all LSPs from its database and stop participating in IS-IS
   • DThe router will reject all new LSPs and refuse to synchronize its database
   Reveal Solution Discussion Select an answer first