2.1 Implement IS-IS (IPv4 and IPv6) 350-501 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   In IS-IS, how are IPv4 and IPv6 routes advertised to other routers in the same area?

   • ABy including IP prefix information in Link State PDUs, which are flooded and used by the SPF algorithm to compute routes
   • BBy sending only the next-hop address in Hello PDUs, allowing neighbors to build a distance-vector table
   • CBy sending the entire routing table in periodic RIP-style updates to all neighbors
   • DBy using BGP to exchange IPv4 and IPv6 routes between IS-IS routers
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   What is a characteristic of single-topology IS-IS when both IPv4 and IPv6 are configured?

   • AIPv6 routes are only advertised if IPv4 is not configured
   • BThe metric for IPv6 routes is always higher than for IPv4
   • CThe SPF algorithm runs once for both address families
   • DEach address family has its own set of LSPs
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4. 13foundation · easy

   How does a Level 1 router in IS-IS reach a destination in another area?

   • AIt maintains a complete map of all areas and computes the exact path
   • BIt floods a query to all routers to find the destination
   • CIt uses a default route pointing to the nearest Level 1/Level 2 router
   • DIt sends the packet to the destination's area ID using the system ID
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5. 14application · medium

   A service provider is deploying IS-IS in a new metro network. The core routers are in area 49.0001, and the aggregation routers are in area 49.0002. The aggregation routers need to reach prefixes in the core, but the core should not learn the internal aggregation prefixes. The aggregation routers are configured as Level 1-only, and the core routers are Level 2-only. Which configuration change is required to make the aggregation routers reach the core prefixes?

   • AChange the aggregation routers to Level 2 so they participate in the Level 2 backbone.
   • BConfigure a Level 2 route leak from the core into the aggregation area.
   • CAssign the same area ID to all routers so they are in a single Level 1 area.
   • DAdd a default route on the Level 1 routers pointing to the nearest Level 1/Level 2 router.
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   An IS-IS network uses narrow metrics. A router has two interfaces: GigabitEthernet0/0 and GigabitEthernet0/1. The engineer wants to set the metric of GigabitEthernet0/0 to 63 and GigabitEthernet0/1 to 64. What is the result of this configuration?

   • ABoth metrics are rejected because narrow metrics only support values up to 63.
   • BThe router automatically switches to wide metrics to support the value 64.
   • CThe metric of 63 is accepted, but 64 is rejected because it exceeds the narrow metric maximum.
   • DBoth metrics are accepted and used in route calculation.
   Reveal Solution Discussion Select an answer first