IS-IS Concepts and Operation JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network engineer is configuring IS-IS on a segment where multiple routers are connected to the same Ethernet switch. The engineer wants to ensure that the network operates efficiently and that the designated router (DIS) is predictable. What should the engineer configure on the routers?

   • ASet the metric to a lower value on the router that should be the DIS.
   • BSet the DIS priority to a higher value on the router that should be the DIS.
   • CSet the hello interval to a lower value on all routers to speed up DIS election.
   • DSet the interface network type to point-to-point on all routers.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which IS-IS PDU types can be authenticated?

   • AHello, LSP, and SNP PDUs
   • BOnly CSNPs
   • COnly LSPs
   • DOnly hello PDUs
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is the purpose of route leaking in IS-IS?

   • ATo redistribute external routes into IS-IS.
   • BTo summarize routes before advertising them to neighbors.
   • CTo allow Level 1 routers to learn routes from other areas via Level 2.
   • DTo allow Level 2 routers to learn routes from Level 1 areas.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which IS-IS network type uses a designated router (DIS) to manage flooding?

   • ABroadcast
   • BPoint-to-point
   • CLoopback
   • DNBMA
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   Without route leaking, how does a Level 1 router reach a destination outside its area?

   • AIt maintains a full Level 2 routing table.
   • BIt uses a default route advertised by a Level 1-2 router.
   • CIt floods a query to all Level 2 routers to find the path.
   • DIt cannot reach destinations outside its area.
   Reveal Solution Discussion Select an answer first