Areas and Levels JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   You are deploying a new IS-IS network for a regional bank. The network has three sites, each configured as a separate area (49.0001, 49.0002, and 49.0003). Each site has a pair of core routers that connect to the other sites via a dedicated backbone. You want the routers within each site to maintain a full topology of their local area, but only know about the existence of other areas through the backbone. Which router configuration will achieve this design?

   • AConfigure all routers in all areas as Level 1 only.
   • BConfigure the core routers in each site as Level 1/Level 2, and the access routers within each site as Level 1 only.
   • CConfigure the access routers in each site as Level 2 only, and the core routers as Level 1 only.
   • DConfigure all routers in all areas as Level 2 only.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   What is the result of running separate SPF calculations for Level 1 and Level 2 in IS-IS?

   • ANo SPF calculation is performed; IS-IS uses distance-vector algorithms.
   • BA single SPF tree that is used for both intra-area and inter-area routing.
   • CA single SPF tree that includes all routers in the network.
   • DTwo separate SPF trees, one for the area topology and one for the backbone topology.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is the function of a Level 1/Level 2 IS-IS router?

   • AIt only routes within a Level 1 area and does not participate in Level 2.
   • BIt only routes between areas and does not participate in Level 1.
   • CIt maintains a single link-state database that contains both Level 1 and Level 2 information.
   • DIt acts as a border router, connecting a Level 1 area to the Level 2 backbone.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   What is the default behavior of a Level 1 IS-IS router when it needs to forward traffic to a destination outside its area?

   • AIt sends the packet to the nearest Level 1/Level 2 router, which then routes it via the Level 2 backbone.
   • BIt floods the packet to all neighbors in the area.
   • CIt performs a full SPF calculation to find the best path to the destination in the other area.
   • DIt drops the packet because it cannot route to other areas.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   Which statement correctly describes the relationship between Level 1 and Level 2 routers in IS-IS?

   • ALevel 1 routers maintain a full view of the entire network, including all areas.
   • BLevel 2 routers form the backbone and are responsible for routing between areas.
   • CLevel 1 routers can route directly to destinations in other areas without involving Level 2 routers.
   • DLevel 2 routers are only used in networks with a single area.
   Reveal Solution Discussion Select an answer first