OSPF (v2 and V3) CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   In an OSPFv3 network, an engineer needs to verify that IPv6 prefixes are being advertised correctly. Which LSA type is responsible for carrying IPv6 prefix information within an area?

   • AIntra-Area-Prefix LSA (Type 9)
   • BNetwork LSA (Type 2)
   • CInter-Area-Prefix LSA (Type 3)
   • DRouter LSA (Type 1)
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   An OSPF network is experiencing frequent topology changes, causing excessive SPF calculations and CPU load. The engineer wants to reduce the impact of these changes while maintaining fast convergence when the network stabilizes. Which configuration should be applied?

   • AIncrease the Hello interval to 30 seconds on all interfaces.
   • BUse a single area to reduce SPF scope.
   • CConfigure SPF throttling with a short initial delay and a longer maximum wait time.
   • DDisable incremental SPF.
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   Two routers, R1 and R2, are connected via an Ethernet link. R1 is configured with OSPF network type broadcast, while R2 is configured as point-to-point. Both routers are in area 0 and have matching authentication. The adjacency is stuck in EXSTART state. What is the most likely cause and the best solution?

   • AThe authentication is misconfigured; re-enter the authentication key.
   • BThe MTU mismatch is causing the adjacency to fail; configure the same MTU on both interfaces.
   • CThe network type mismatch is causing the adjacency to fail; configure both routers with the same network type.
   • DThe router IDs are conflicting; change the router ID on one router.
   Reveal Solution Discussion Select an answer first
5. 9expert · hard

   A dual-stack network uses OSPFv3 with both IPv4 and IPv6 address families. The network has a totally stubby area (area 2) that only needs IPv6 connectivity. The engineer notices that IPv4 routes are not being advertised into area 2, but IPv6 routes are. What is the likely cause?

   • AThe area 2 routers do not have IPv4 addresses configured.
   • BThe IPv4 address family is not enabled on the ABR for area 2.
   • CThe totally stubby area blocks IPv4 routes by default.
   • DThe IPv4 routes are being summarized and not advertised into area 2.
   Reveal Solution Discussion Select an answer first
6. 10expert · hard

   An OSPF network has an NSSA area that redistributes external routes from a legacy network. The engineer wants to prevent the external routes from being flooded into other areas while still allowing the NSSA to receive a default route. Which configuration should be used?

   • AChange the NSSA to a stub area.
   • BUse a standard area and filter Type 5 LSAs with a distribute list.
   • CDisable external route redistribution on the ASBR.
   • DConfigure the NSSA area with the no-summary option and a default route.
   Reveal Solution Discussion Select an answer first