300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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QuestionQ131

Unicast Routing

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Refer to the exhibit. All four routers in the network are located in the same data center. The four routers run IS-IS between them in Level 1 mode within an IPv4 network. After a network engineer installed several new servers connected to R4, users connected through R1 reported that they could not connect to applications on the servers. The engineer determined that R4 receives routes from R3 but fails to receive routes from R1. Which action must the engineer take to resolve the issue?

  • A Configure R2 only to be a Level 2 router.
  • B Configure R1 and R4 to be Level 2 routers.
  • C Configure R3 only to be a Level 1/Level 2 router.
  • D Configure R2 and R3 to be Level 1/Level 2 routers.
Explanation

IS-IS Level 1 routers learn routes only within their own area. R1/R2 are in area 49.0001 and R3/R4 are in area 49.0003, so interarea connectivity requires a Level 2 backbone. R2 and R3 must be Level 1/Level 2 routers: each maintains its local Level 1 adjacency while also forming the Level 2 connection that transports routes between the two areas.

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