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

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QuestionQ205

Routing Policy and Manipulation

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Refer to the exhibit. OSPF is the interior routing protocol in the network. Routers R4 and R6 are in area 0, and all tunnels are in area 2. R4 is connected to R6 by a 1-Gbps link and to the rest of the LAN by 100-Mbps links. After the latest maintenance window, a network engineer notices that R4 is using a suboptimal route toward 10.173.12.10 rather than the route through R6. Which action must the network engineer take to correct reachability toward 10.173.12.10/24?

  • A Configure auto-cost reference-bandwidth 1000 under the global OSPF configuration on R4.
  • B Configure ip ospf cost 120 under the Gi0/0 interface on R4.
  • C Configure ip ospf 2 area 0 under tunnel 3 on both R6 and R5.
  • D Configure ip ospf 0 area 0 under tunnel 2 on both R4 and R5.
Explanation

With OSPF's default 100-Mbps reference bandwidth, both 100-Mbps and 1-Gbps links receive a calculated interface cost of 1. Configuring auto-cost reference-bandwidth 1000 on R4 differentiates them: the 1-Gbps link has cost 1 and a 100-Mbps link has cost 10, so the route through the higher-bandwidth path is preferred.

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