300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ326

Layer 3 Technologies

Refer to the exhibit.

Question Image

Router R1 peers with two ISPs using static routes to reach the internet. The requirement is for R1 to prefer ISP-A during normal operation and fail over to ISP-B if connectivity to ISP-A is lost. The engineer notices that R1 is load balancing traffic across both ISPs.

Which action resolves the issue by forwarding traffic only through ISP-A, with failover to ISP-B?

  • A Configure two static routes on R1, one pointing to ISP-B with more specific routes and another pointing to ISP-A with summary routes.
  • B Configure OSPF between R1, ISP-A, and ISP-B for dynamic failover if any ISP link to R1 fails.
  • C Change the bandwidth of the interface on R1 so that interface to ISP-A has a higher value than the interface to ISP-B.
  • D Configure two static routes on R1, one pointing to ISP-A and another pointing to ISP- B with 222 admin distance.
Explanation

Static routes with equal administrative distance are equal-cost paths and can load balance. Configure the ISP-A route with the default administrative distance and the ISP-B route with administrative distance 222. The higher-distance ISP-B route becomes a floating static route, so the router prefers ISP-A and uses ISP-B only when the primary route is unavailable.

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