2.1 Implement IS-IS (IPv4 and IPv6) 350-501 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network engineer is enabling IPv6 on an existing IS-IS single-topology deployment. The current network uses narrow metrics and all interfaces have the default metric. After enabling IPv6 on all routers and interfaces, the engineer notices that IPv6 routes are not being installed in the routing table, although IPv4 routes continue to work. What is the most likely cause?

   • AThe interfaces are using a metric that is too high for IPv6.
   • BThe NET is missing the IPv6 address family identifier.
   • CThe IPv6 address family is not enabled under the IS-IS process on all routers.
   • DThe system ID is not unique for IPv6.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A service provider is deploying a new IS-IS core with two areas: area 49.0001 and area 49.0002. The routers in area 49.0001 must learn about prefixes in area 49.0002, but the area 49.0001 routers should not see the detailed topology of area 49.0002. The design team wants to minimize the number of LSPs flooded across the core. Which IS-IS configuration approach satisfies these requirements?

   • AConfigure all routers as Level 1/Level 2 and rely on the SPF algorithm to limit topology visibility.
   • BConfigure the border routers as Level 1/Level 2 and the internal routers as Level 1 only.
   • CConfigure routers in both areas as Level 2 only so they share a single Level 2 topology.
   • DConfigure all routers as Level 1 only and redistribute between areas at the border routers.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A service provider is designing a new IS-IS network and needs to support a large number of links with metric values exceeding 63. They also want to use the extended metrics for traffic engineering. Which IS-IS metric style should they configure globally?

   • ANarrow metrics only
   • BBoth narrow and wide metrics
   • CWide metrics only
   • DLegacy metrics with a default of 10
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   What is the main advantage of multitopology IS-IS over single-topology IS-IS?

   • AIt automatically redistributes routes between IPv4 and IPv6
   • BIt reduces the number of LSPs by combining IPv4 and IPv6 information
   • CIt eliminates the need for SPF by using precomputed routes
   • DIt allows IPv4 and IPv6 to have independent topologies, so links can be enabled for only one address family
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A service provider is deploying dual-stack IS-IS in a network where IPv6 is only enabled on a subset of links. The IPv4 topology is fully meshed, but the IPv6 topology has a different set of adjacencies. The network team wants to ensure that IPv6 routes are computed correctly even though the IPv4 and IPv6 topologies differ. Which IS-IS configuration should they use?

   • AMultitopology IPv6
   • BIPv6 on all interfaces with the same metric
   • CRedistribute IPv6 from IPv4 routes
   • DSingle-topology IPv6
   Reveal Solution Discussion Select an answer first